He certainly has the physical and the mental tools required of a successful NFL QB. Nobody knows for certain how he will adapt to the NFL but he does have a very good chance at being a winning QB.
What is critical is where he goes in the draft. If he goes to a team and is thrown into a starting role immediately he might struggle. Not too many college QB's can take the reigns of an NFL team from day 1 and succeed.
If he has time to absorb everything, before being thrown into games, there is no reason why he won't be good for many years.