I think JB in general is not the problem. He is a great coach. Not good, great. However given the historical state of UMs basketball program support, and unless that changes, UM might need a really big name and/or an incredibly fiery, maybe young coach, maybe a combination of the three (big name, young, fiery). That person may or may not be out there.
Regardless, IF our A.Dept, students, fans, etc. took basketball and the program more seriously, a guy like JB, enthusiasm for the program, attendance and all those great things that come with it would occur more frequently rather than just when the team is on obvious runs to potential Big Ten Titles like in 2012, 13 and 14.
This is more than about a coach. Michigan hoops is stuck in a chicken and egg cycle that is not going to be easy to get out of unless the A.Dept makes some big, tough, bold choices.
My #1 of many moves would be this. Because all enthusiasm in college sports starts with the students, I would duplicate the bleachers on the opposite side of the current student bleachers, keep those seats next to the band, and stop selling student tickets in the upper level altogether.
From a marketing standpoint and the standpoint of showing the students they matter to the program, his, IMO, is an obvious first move and can't be done soon enough.