Lets be honest, Mourinho was never knowingly undersold.
We knew what we were getting from the get go and most fans were happy with the success he brought of two cups and 2nd place finish in the PL, if not with the style of football. It seems that Jose himself believes what he achieved that season, especially finishing second in the PL, with the squad of players he had, was one of his finest achievements.
However Mourinho is a 'time bomb' of a manager, he either goes off with a successful 'bang', like winning the Treble in Italy, or he explodes in fits of temper that saw him leave Chelsea and United under something of a cloud. Either way Jose walks away with lots of money, always has done and if he can find another club who think they can tell him what to do, he will grab the offer with both hands.
I cannot ever see Jose staying too long in any football management job, even his so called intended 'last job' of managing Portugal. Mourinho does not build for the future, he has no interest in long term plans, only in the here and now. However, to do that he needs to be in control of everything and of course at some clubs, ours included, that was never going to happen, especially if some of his decisions early on proved less than successful.
Yes there are some United fans who would have him back, as with LvG and even Moyes, but most want a manager who can build a dynasty, but unfortunately we can't wait whilst they do...so, the next United Manager most come complete with 'Magic Wand'.