It's a good move for him and completely understandable. I don't think this has anything to do w/Mike Bohn or the University's handling of the program(s), that's typical stuff as people look to be negative and blame somebody for what's going on. It's been easy to pick on Bohn and the administration.
I think it's pretty obvious (much thanks to coach BZ and his vision) that the University is actually behind the basketball program(s), more than ever before. It helps that the state of the football program has been dismal recently, but basketball suddenly matters at CU. So that's not it.
This is -quite frankly- a matter of family first, his wife and kids likely approve. You also must understand that Bzdelik has mentioned that being an assistant at Davidson (N.C.), with good friend Rick Barnes I might add, was arguably the most fun he's ever had, he was growing and learning the coaching profession, and around good/fun people. Plus, North Carolina is a beautiful area, likely one of the few places that folks would consider moving to over Colorado, and it certainly doesn't hurt that he'd be moving to a program that is clearly a step up from CU, and one that has loads of tradition and will likely grant him immediate success, perhaps much-much more.