I think what Sullinger needs to become an All Star NBA player is to work with an NBA training staff. Beyond that, I don't think college is going to do much more for him from a basketball perspective.
Of course, I don't blame him from pulling out from the draft though. With the risk of a lockout, he could have no place to play (at least in the US) next year. So, instead he gets to the king of campus for another year, and make another run at a championship, rather than risking sitting around a year, racking up debt, because he is not being paid, and no longer gets room and board for free at school, and missing out on an experience which may help him to continue to mature as a person.