Brian of mgoblog put together an excellent piece on why Michigan shouldn’t completely change their offensive to a traditional power running game:
This isn’t 2008, when Michigan was screwed no matter what offense they put in. Getting Michigan’s offense to go from explosive but inconsistent to world-destroying is a matter of getting a kicker, finding a good running back, working on Denard’s reads and accuracy, and leaving everything else the hell alone.
My historical knowledge is not so great. But I don’t know that there have been many times that a new coach has been brought in with a Heisman candidate QB in place and drastically changed the system the way Hoke is planning to. As Brian also points out, this is an offense that is bringing back almost every starter and has a lot of experience.