Yes I do think he should be replaced.
He has led them out of dark times. I agree withthat. And he did that well. However, that is all I think he is able to do. Cody Zeller (who he recruited and that was a HUGE one) led them out as well.
Coaching
He gets out coached every time an adjustment has to be made. At halftime, other coaches make changes agaisnt IU and Crean does nothing to counter. Teams will change defense or make other adjustments, and he doesnt react. And when losing, he doesnt make any! He makes it too easy for the other team. You would like after the beating SU gave them last March with that 2-3 Zone, 7 months later, they threw the same zone at him and he had no answer!! I live in Syracuse and you can see all teams make adjustements on that zone! Not Crean though.
Inconsistency
You beat Michigan and Wisconsin at home. Then, lose to Nebraska, Northwestern and PENN STATE at home. The team playing good on same days and then good on other days is a coaches problem to fix. He is too soft on them. Yea, he yelled during the Wisconsin game, at the scorers table at the people keeping score and so the fans can see. Not directly at a player(s). Losing to those teams is an embarrasment.
Recruiting
He is ok here however other then Zeller, never gets the BIG one. Other school do. It was nice to see Blackmon recommiment though. They arent coming to IU and its hard not to blame them. Who wants to lose to Penn State and other crappy teams (at home).
Mystery
People are leaving there. People are transferring ( Remy Abell, Creek, Luke Fischer) and people leaving Calbert Chaney. Why? Not saying all Crean however it is a Mystery.
He did a great job of getting the ship on course. Not doubt. However he is not the guy to take IU to where people are use to seeing them. If winning a game, I am sure the opposite coach will make a haltime adjustment. The PSU game was great example of that. He gets our coached too much and never really out coaches any one else.