I am one who thinks the guy has potential. He has had minimal coaching in the NFL and not much training camp time. The questions about him are whether he has the head to process all the stuff a QB needs to deal with, and whether his passing game can come up to NFL standards. I think it's safe to say that his passing can improve; the question is how much.
But he could step in tomorrow and be an effective running back in a "slash" style, with a threat to pass. I wouldn't be a bit surprised to see the Jets use him in "slash" situations.