There is certainly a stubbornness about Wenger and some things he is unwilling to change. But is refusing to demand £150m for players and then asking for another £150m because it isn't working really a weakness? Wenger is operating at Ar5ena1 the way Levy expects his managers to operate at Spurs, within the means of the club. When Wenger leaves it will be interesting. Will they have a temporary decline like United, with a spacegoat like Moyes, or will the owners finally decide to open the cheque book and get a van Gaal?
I think both United and Scum will struggle for some time to come, I really believe LVG will end in tears sooner than later, and neither will be in City/Chel53a league (United had to spend $200M+ to get close, and still have huge gaps, Cheat$ki will just go spend another 150M and put distance again). Manure (even under SAF) and Scum made a fatal mistake in letting Chel53a & City build up so much better squads than them.
Re previous point about Wenger, it's not about the cost of the buys, it's the application. If the Ozil money had been spend on a Keeper, a CB & a DM (and yes they could have), they would have been much more of a threat last season.