I think basically any manager in the world could have done as 'well' as he has.
If they are stupid enough to keep him on, maybe the next 1/4 billion that he spends will help them into the top 4 again. If he doesn't get them playing interesting football though, he should be gone pretty soon.
The bomb was put in old trafford by the fans to blow themselves up for watching such a poor season haha.
But yeah he has done a poor job 1/4 billion = top 4 everytime or sack. Mouriniho is heavy fav to take over anyway check the betting odds.
Dude check the odds on mouriniho as next united manager:
http://www.oddschecker.com/football/football-specials/man-utd/next-permanent-manager
^ those odds mean its more or less a done deal, unless something crazy happens mouriniho has the job, probably only health issue would stop him or getting hit by a bus.