I heard an interesting inteview this morning on Steve Czaban's show with a reporter from the Kansas City Star. The reporter's take was that Mangino was a jerk and a bully and had been since arriving on campus. Players, present and former, and their parents had been to the administration to complain about his methods, and virtually no one within the university got along with him.
While he was winning, this was tolerated. Now that he isn't, every minor incident becomes major. Add to that a fear by Kansas that he could drop dead on the sideline at any given moment, and the ice beneath their enormous coach gets thinner every day.
I don't know the situation well enough to comment for myself, but the reporter was right about one thing--if you are going to be a jerk, you had better be successful.