As I understand it, Arizona's position with Miller is just a wee bit precarious. I believe there is something like a $12 mil buy out associated with his contract, however if he is dismissed 'for cause', Miller gets nothing. The university has to produce incontrovertible evidence of misbehaviour in order to use the 'for cause' stipulation. If they fired him now, based on what is known publicly, Arizona has to pay him. It's a public relations nightmare for their administration, IMO. The situation isn't helped by the fact that half their fan base is in denial. I suspect that their AD is hoping the NCAA can produce the evidence they need to let him go. I believe the 'buy out' goes down over time, but the longer this continues, the worse it becomes for them. Morale inside the program cannot be good.
Edit to add: The situation there is further complicated by the buy out Arizona is still paying Rich Rodriguez, IIRC.