I think the accuracy on the deep ball has more to do with pocket pressure than his actual skills. The major issue I have with his game is the level of awareness or unaware..ness? he seems to have in the pocket. He never really feels the pressure coming, but that is what most young Qb's go through during their development stage. Can he overcome that? He obviously doesn't have that 6th sense so he must learn it. He's definitely durable and a tough guy. People forget how much punishment that kid took the past 2 seasons and take that for granted. Most Qb's buckle and decline after taking the hits he has taken these 2 years where he has only gotten better.
I think he'll be fine in the long run, he just needs to learn when to tuck and run. That's the only part of his game that needs serious work. The accuracy and deep ball comes with repetition and time.