[jasonrr]

The Khan Academy is not seeking to replace teachers/coaches/tutors. The good ones will take advantage of what resources like the KA have to offer. On the other hand, a bad teacher has the ability to damage a student's ability and desire to learn for years.

There is a chance that the Khan Academy could make the world bad-teacher proof by giving students a resource with high quality guided instruction that includes mechanisms to keep them motivated, and I think that is nearly equally important.

(disclosure: KA Designer)