Some of you are forgetting 2012.
We ran a lot of read option and shotgun early in the year with little success. Chud had a come to jesus meeting with Rivera mid-season, and after that point we were a more traditional offense. During that period, Cam played very well taking snaps under center.
So just because we have run a lot of plays out of shotgun recently doesn't mean Cam is going to somehow regress or play poorly taking more snaps under center.