It's still a bit like replacing Modric with Joe Allen or Jonny Howson, rather than say Javi Martinez.
Barcelona don't need a manager (and managers often don't work at Barcelona). They have such a strong system/DoF that they only really need a coach.
It's not at all.
The thing with these 'we must appoint a big name' approaches is that it can just as easily fail. So many coaches have initial success in their first couple of roles, but then spend the rest of their careers aimlessly floating around from one job to the next. A lot of the time, the main reason they had success in the first place was because they had a favourable set of circumstances at a club which allowed them to do so. Success doesn't just come with appointing a manager who has won something before and watching it happen. It's about having the right circumstances, the right approach from the very top down to ensure the best possible chance.
Saudi Sportswashing Machine appointed Alan Pardew. They didn't think 'we want to be good again so lets throw money at someone that has won something with a big club' because it just doesn't work. You had players like Enrique laughably saying that Saudi Sportswashing Machine would never challenge for a place in the top 6 again...and they are definitely going to finish above Liverpool. The appointed the right man for the work that needed doing, based on the approach they were going to take. Signing some 'big name' to work with largely unproven players from the French league would likely have ended completely in tears, because this big name is used to working with proven players, managing the big egos to the high expectations. Their skill set wouldn't be in extracting greater performances from a perceived weaker squad.
And there are so many examples like this. AVB was given a chance at Porto after one season at Academica. Numerous coaches get given a chance on the continent so why can't we do the same thing? We just have to make sure we get the appointment right. Milan did well with Allegri. Inter didn't with thier manager, but he had success because he employed a very particular tactical system at his old club that Inter didn't have the players for. The directors should have looked at what made him successful and judged whether he would be able to replicate that success with them.
We don't need a 'big name'. Almost nothing about us suggests that we need a big name. If we had a squad on a par with United and City, then I'd say we need a big name. We'd need someone used to giving that bit extra to the top players. But that's not where we are. We need someone proven in making players over perform because we have a lack of resources with our nearest competitors. An international coach who benefits from a consistent strategy from the lowest youth level upwards to provide him with world class players isn't what we need. A guy who has won titles isn't necessarily what we need. It might work, but it's no guarantee. He isn't going to win us titles just because he has done it at a place where he had more money. There's so many examples of managers that are successful at one club and not so much at the next because the circumstances are different. There aren't too many managers that have a track record of going from club to club, collecting trophies wherever they go. Mourinho is one of the exceptions, a managerial freak that was put on the earth to do this.
People say we should 'take a punt' on Rodgers because it isn't actually taking a punt at all. It's getting hold of one of the brightest young coaches in the game and letting him do his thing. What do we need? What's going to make us over perform in spite of our wage cap and more limited transfer funds? It's going to be a system that makes the players function better as a collective than as individuals, because we are never going to have individually the best squad.
And why exactly would Rodgers fail? What exactly can be held against him? The fact that he's never had the chance before? Means bugger all. Avram Grant took Chelsea to a CL final but World Cup winner Scolari failed with them. It's about the circumstances and whether the manager is right for the club. Rodgers has shown he can make inferior players play the way he wants, so he can almost certainly get our players playing that way. He manages his squad well, he rotates, he's tactically aware, he has modern ideas that give him an edge. He has worked at a big club before, under the best manager in the world, and will have seen there how to handle big name players. But it's not as if 'big name players' are that much different from any other people anyway. They are footballers and will do the job they are told to do unless the manager is seriously clueless, which Rodgers clearly isn't.
He is successful playing a style that will suit us, so what's the problem? Why wouldn't he be a success with us? I haven't really heard one convincing argument against him, except for the fact that he has never done it before. But I don't really know how that prohibits him. Maybe if he had gotten his success playing a system that meant his players didn't see much of the ball, and that it may be hard to adapt to a bigger club where they have more possession. But he is already suited to playing the possession game! He's a knowledge sponge, and has studied all over the world, but hasn't copied, he has taken ideas and mixed them with his own ideas and identity. We need to get hold of someone like this to get ahead of the curve, to give us that edge.
The argument that you need someone proven further doesn't hold up when you consider all the managers in this league. SAF had 'only done it in Scotland'. Mancini had 'only done it because of the Italian scandal'. Wenger was a nobody from Japan. Pardew was a failure at West Ham. Harry has one cup in 30 years of management. Di Matteo was sacked from West Brom. Moyes came from Preston. Dalglish has had just as much failure as success since leaving Liverpool the first time. Jol failed at Spurs. Hodgson failed at Liverpool. O'Neil has never had a big job. Neither has Rodgers. Neither has Lambert. Pulis plays boring football. McCleish could well have two relegations in 2 years. Hughes failed at Emirates Marketing Project. Martinez has never had a big job. Neither has Coyle. Kean is hated by his own fans. And Connor is leaving.
That's every manager in this league. Not one of them has been a proven top level success where ever they have gone. Because it doesn't exist. Of the successful ones there, they are the ones that suited the club and had the favourable circumstances and environment to make them successful. SAF, (maybe Mancini), Wenger, Pardew, Redknapp, Moyes, Jol (doing as well as can be expected), Hodgson, Rogers, Lambert, Pulis, Martinez.
The above are the successful ones. Again, none of them 'proven' big managerial names before hand, but they were right for the club. Even less successful ones, RDM is unproven but may win the CL, Dalglish has won the league with 2 different clubs, O'Neil got Villa 3 top 6 finishes, McCleish has won a cup, Hughes could well keep QPR up and Coyle has shown great promise with Bolton playing good football but have been unlucky with injuries.
Abroad, there is no coach that has been successful everywhere, except for Mourinho. Ancelotti would have been, but may not win the league with PSG and all their money. Again, it is all about the manager being right for the club. If a big name has had success somewhere else, maybe they would be a success with us, but you would need to show they have the same sort of circumstances here to be successful, or they have shown a particular aptitude for adaptability so they can do something else with us. But right now, a guy like Rodgers seems right for us. I haven't heard any compelling reason as to why he wouldn't be. Definitely 'worth a punt'.