I've watched most of Khan's fights have been impressed by his speed and accuracy.
Having said that, he doesn't yet have the power to take out someone with one punch, and most of the guys he's fought are past their best or from a lower division, although this is typically the way things are in the early years of a career - another curse of being the hope of the nation!
I think he will at least be a Eurpoean Champion, and will gt to challange for some World titles, but I do think that unless he learns to defend himself, which is hard when you're constantly dictating, he will get taken appart by a more experienced boxer who will let him fire off his quick hands against their guard and get him on the counter.
I think he should listen more to Warren, and let Warren take his time in moving him forward, otherwise he could end up in the same state as Audley Harrisson, although it would take come effort to end up in the same kind of carrer train wreck as Audley.