I mostly agree with you and have said that Poch isn't going anywhere for at least a couple of more years, but I don't think its wise to be so complacent and believe Man Utd isn't a big draw even for someone like Poch. They are financially gigantic, they can afford anyone they want, and of course it's true that Poch is not a cheque book manager but Utd are still a club that believes in bringing through the kids as an underlying philosophy which would be attractive to Poch. Plus his great hero Ferguson is still influential at the club. It would be the ideal scenario for Poch, the support to build a young homegrown base but still have the unlimited funds to buy one or two superstars who of course would have to have the right attitude.
However I believe he loves Spurs right now and he has such a fantastic group of lads to work with. This, the new stadium and the training facilities all add together to make him want to stay no matter who comes in for him.
Literally not worried about United at all. In 3 years, Poch has well and truly got his team, his youth set up, his culture in the club. He's in the new stadium, he's got the best training ground around, and a squad full of players that are loyal to him. And he's going to United for what? To do it all again? For a bigger transfer budget? It would be all so utterly pointless, particularly for a guy that genuinely seems different and focused on showing loyalty like Poch.
He's at the perfect club for him and he knows it. The fact that he's not a cheque-book manager is massive. It would make no odds to him that he'd have more money to spend, when it would mean shoe-horning a superstar into the side at the expense of team unity. United is now a club that wants to show off their brand and make statement signings. They should have gone for Poch instead of LVG. If he went, they would have got someone awesome and probably the true heir to Fergie in terms of how to run the club. Now? He's found his true home. It's too late for United.
If for some reason Levy and Poch fall out, then I'd be worried. If we give him any reason to question our loyalty to him, I'd be worried. The delicate balance for us is keeping that relationship working. Levy managing performance and doing well with the strategy of the club, and trusting Poch when appropriate and going against him where appropriate (as sometimes Levy will know best).
I'd also be concerned if we move to our new stadium and need to adapt our strategy to paying bigger wages and maybe attracting a higher caliber of player (otherwise, no point in moving). Can Poch adapt to that? When the expectation will be to sign a star, relatively speaking? When our players are getting paid closer to top dollar and aren't as motivated by the bond, the journey, but by the expectations of being genuinely top players and recognised as such. That will be a test for him and so far he's shown he can be adaptable, but it will be a different sort of environment for him.