Jason had to work very hard for his career, including more than one stint away from the Association. But he had two marketable skills going for him - he was a true point guard, and he was a very good defender. I don't see what NBA skills that Dion has - he's not a point, he is a poor 3 point shooter for his position, and the jury is out about his defense. His only real skill is the ability to drive and finish, but he will not have the advantage of physical mismatches in the NBA - indeed, he is undersized for his position.
I hope he continues to prove me wrong, but I just don't see a long career in the cards for Dion. Hope he gets a lottery selection and the guaranteed millions that come with it, because I have my doubts about his longevity (in the NBA, at least - he could be a superstar in many foreign leagues)