You also completely skip one of the main arguments in favor of a college education. Does Khan Academy also provide an atmosphere where students can study, party, hook up, make mistakes, and otherwise learn how to become members of society? I don't think there's a YouTube channel with that feature.
Granted, kids shouldn't pay $40k a year to party, but you're declaring victory over lecture halls with a collection of online classes that started a week ago. We're a long way off from fixing education--a couple of YouTube videos and a single co-working space on the West Coast are one in many steps we need to take.