IMO the Khan approach could and should be a component of education. However, I worry that we often think of education as a process rather than a journey to be experienced. The Khan approach is similar to reading in that the lesson is static. However, in a lecture with a small group, you not only can have instant feedback and clarification, but you can have digression and serendipity. I am sure that some of this can arise when students get together for work, but an inelastic lecture has its limitations. IMO education should be messy. It should be efficient at times and inefficient at others. Khan brings a great tool, but I honestly would prefer a good mix of live lectures. Some of the things that I remember most from lectures would not have been included in a generalized version, as they typically concerned personal anecdotes of the lecturer.