You're out of your mind.
Denard Robinson is the entire Michigan offense. If he is out in the second half Nebraska wins this game no matter if it is close or not. No way Michigan scores with that back up QB.
If he does return, he is their entire team, literally. So either he will go down again because he gets hit every play or if he doesn't all you have to do is key on him and force him to pass.
On track to lose this game for sure.