I think he will have a difficult time in the NBA. At the point, which is not his natural position, he is going to have to match up with 6'4" guys who are longer, faster, and more physical than he is.
At the two, he is going to have to match up with 6'8" guys who are longer, faster, and more physical than he is.
I think at that level his physical limitations will catch up to him. That in no way is an attempt to diminsh him as a player; he is an outstanding college basketballer. I just don't think he is built to excell in the NBA.
PS--I hope trememdously that someone has the opportunity to recall this post about 3 years from now to show me how wrong I am.