I somewhat disagree with the sentiment that Glass will move on from Crean if he doesn't improve from where he is now. I just have a hard time seeing Glass being a guy to not retain Crean if he is winning 25 games or so per season, going to the tourney, and competing for the B1G, even if he is not getting past the Sweet 16. The only way that might change would be for fans to stop attending games, but absent that, I just don't see it. He is paying Crean market for the results he is getting, I think (this is without doing any research on salaries).
Let's be honest. Crean's results are not "that bad" overall. A couple of B1G titles recently, playing into the second weekend of the tournament, beating ranked teams, winning B1G coach of the year, and doing it with good kids who are graduating and with a perfect APR. I just don't know that I see Glass as being the kind of AD that will look at that and say "this isn't good enough", absent some sort of external factor (fan attendance, pressure from big boosters, etc.). Not sure that anything Crean has done would qualify as "fireable". That's why where IU is right now sucks, because you aren't competing at the level most of the fanbase would like, but the team is consistently good enough that you can't make a change without intense media scrutiny. Not sure, absent a massive salary increase to $4-5 million, why a potential new coach would look at the results that got Crean canned/not retained and would not have serious reservations about expectations and their long term security.