Khan has a lot of heart, but with a chin like his, he can only go so far with carefully selected opponents.
They need to keep him away from bangers and pressure fighters. He'd outbox the best of them, but he seems to have serious stamina problems, which show from the mid to late rounds.
That being said, with a style and chin like his, i don't see him fighting until the age of 35 like the TS seems to suggest will happen.
He's been in some serious wars at only the age of 25. He'll come back strong again, but i don't see him lasting against the elite at 147 if he was to move up.
I wish him all the best, and he's never afraid of a challenge, but fighting until 35 years old? Khan is all about speed. That speed won't hold as he gets older. Just ask RJJ.