He wasn't really given a chance.......and RichRod didn't help matters.
Michigan is a proud and premier program historically. They have developed this ideal of what their style of play should be.......tough, physical defense.....and a tough, physical running game. Their traditions are old and held in high reverance. It was quite a shock to even hire Rich Rod.....who runs a polar opposite style of play.
Rich Rod had to completely overturn the roster.....which takes yrs to accomplish. During this time he didn't win a ton......and he rubbed a lot of the fans/faculty/alumn the wrong way when he trashed a lot of the traditions that Michigan holds so dear. Then he was let go before ever getting a chance to shine. He would've soared with them and been national contenders every yr.
Then they hired Hoke. A man who upholds the traditions of Michigan and has their style of play. He recruits decently.....not stellar, but decently. His first order of business is to repair the relationships with the fans/alumni/faculty and to completely overturn the roster back the other way.....which takes yrs to accomplish. At first he utilized more of the spread concepts.....utilizing the personnel that Rich gave him.....and this worked at first. But as he tried to change over to the ground/pound offense, he was forced to play more and more underclassmen....and the losses piled up. And thus, he was let go before he could succeed.....
Now, Harbaugh. He has pretty decent talent to work with.....and it's talent that is geared towards the Michigan style of play. If they can grasp the system and new coaching quickly they can do well. They lack a QB, but most positions will return most everyone for next yr. He'll likely have them winning double digits by 2016......or possibly 2017.
This issue for Michigan remains, however. They are fixated on this "Michigan Man" and the "Michigan Style" of play. They've become so tunnel blind. What if Harbaugh leaves after a few yrs? Then what? Are they willing to accept some more yrs of poor seasons while they search for someone that may or may not be out there? At some point they are going to have to let go.....