Bronco is too nice of a guy to coach at another big time program. BYU, contrary to what the haters think, is a nice guy program and pretty much recruits itself. These other programs are buying players and fixing grades just to try and keep up. I really doubt Bronco would look the other way on those issues.
College football is all about recruiting more so than Xs and Os.....and to compete at these programs you have to ignore some of the rules. BYU is an exception as one of the few schools that can compete by doing it right. I don't think Michigan could.