He needs 2-3 fights before moving up to 147. He has all the ingredients to be Huge but alot of work needs to be done. The whole standing on the ropes and eating upper cuts was pretty stupid iMO
I don't see how Bradley and Alexander can beat Khan after Khan took that 10th round beating and came back to win the 11th and basically hung on in the 12th while giving Maidana some hits in the final seconds. If Khan isn't afraid of the power, his speed will basically win the fight like he did against his previous defenses prior to this fight. And I don't think either Bradley or Alexander has Maidana's power at all.
Khan's probably another 2 decent wins (or one really good win) away from landing himself a top 10 P4P ranking. He's doing some quality work at 140.
He shouldn't rush upto 147, think he should try an unify at 140, at 23 he has plenty time on his side, his strength will only increase.
He should rematch Maidana. Fight the winner of Bradley/Alexander. Fight Ortiz. Then move up to 147 for Berto. Fight Floyd in early 2012.