The thing is that, as he showed last season, Mourinho can't do crisis management, since his gigantic ego and pathological narcissism mean he is only capable of making things worse. A few more lost games and some concerted media pressure could make things interesting.
I'm not saying it's likely, but he showed real weakness with Chelsea last season and he's let the press get a taste of his blood, so the possibility of meltdown is always there.