To be honest Mourinho is a great manager, honestly he is. His track record speaks for itself and he would do a lot of good at most clubs, I think he is better suited though at relatively poorer clubs where he can build the teams he wants. His problem is the club he is at, he has been found out in England mostly because he has inherited a dressing rooms of egos and a culture that someone like Pep wouldn't touch with a bargepole.
For them it comes down to transfer policy and he either has no say or very little say and that is pretty much why they are in the state they are. He hasn't got the backing to get rid of the rot and buy in the team he wants, he didn't have that at Chelsea really the second time around either.
For them spending £200m on Pogba or £300k a week on Sanchez is more important than using a portion of that to get them a Bernardo Silva, Gundogan and Fernandinho.
He won't go I don't think but to be honest it is pointless any manager going there because they are only interested in signing players that sell shirts.