Hasn't he also indicated that he'd like to manage the national team at some stage as well ?
I just personally find it somewhat interesting, when the shit hit the fan at Chelsea at the beginning of his third season, the majority in here was taking the piss out of how he'd completely lost the plot and was spiralling out of control. That the clash with the medical staff was classic Mourinho. Now we're back to how it's circus Chelsea (which, regardless, to a large extent is true)
I don't think it's impossible, far from it, that Mourinho feels the need to settle down and that United can be the perfect club for him in that regard. How likely it is, well, as i've said i'll be very surprised if he stays here more than 3 seasons. He's a winner, and if he's not winning there's going to be problems, and i don't think it's likely that we'll be winning any big trophies this season.