I actually think Joey will play a long time in the NBA. I don't disagree that he was one dimensional last year in what should have been his freshman season, and he has a ton of room for improvement, but he's really big, he's athletic, and his best skill is shooting. Unless he turns out to be an awful defender (I don't think he will), he's going to eventually be a staple in 10 man NBA rotations for a decade. That's just how the league values shooting now.
I'd be surprised if he doesn't become a starter at Duke by his junior year.