I hope not. Unlike Pac, Khan can speak good English which means I have to listen to him complain about racism constantly? Hopefully Khan accidentally takes a banned substance thereby discrediting him.
The question about his chin will remain until takes a shot from a hard hitting fighter. With his hand speed though, he has the potential to cause most fighters at 140 trouble.
Roach has landed himself another very talented fighter. When Pac calls it a day, Khan will ensure Roach will still be at the sharp end of championship boxing. After a shaky start to his career, only a fool cannot see Khan is improving all the time. He seems a lot more solid and sure-footed, stronger at 140 than at lightweight. A couple more wins and he should be challenging the big guys at 140. Khan has what it takes to be champ at 140. 147 is still very rich in talent and perhaps a bit too big for him at the moment, but at 140 he's looking very good.
I've yet to see Khan face a legit threat. But he seems like a good prospect as Roach's new student. We wont be seeing another Pac in a long time though.