The recent history of quarterbacks changing positions is somewhat shaky. Antwan Randle El was able to carve out a role as a receiver and returner who ran the occasional reverse (and threw reverse pass). Josh Cribbs has become one of the best returners in NFL history, and has made his fair share of plays on direct snaps and Jet Sweeps. Armanti Edwards, recently of Appalachian State, hasn't done much of anything in the NFL. The Miami Dolphins tried to develop run game packages solely around Pat White's talents, and the results were below average. A mixed bag.
It is widely assumed that Robinson will be switching positions at the next level. While he has repeatedly expressed an urge to stick with quarterback, his rudimentary skills in reading and reacting to complex NFL pass coverage schemes, as well as his erratic footwork, are most likely going to be his undoing with NFL scouts.
Robinson, however, should find a role in the NFL somewhere. He is a superb runner that is already very skilled at working in a zone rushing scheme, finding creases, and making reads of a defense in the run game. Not to mention the whole fast-as-hell thing.
This is a pretty good look at Denard's future as a running back and what kinds of things he has already shown an ability to do at an NFL-ish level. Certainly something to think about....next year.