True, but Khan Academy doesn't significantly deviate from the hypothesis in the model -- if you provide the content for free, it's as cheap as or cheaper than all the alternatives {do nothing, $pay_service_from_a_startup, $government_subsidized_service}. At that point, it becomes a quality issue.

I think that you and the OP have similar values -- the key takeaway is that you're probably not going to become a billionaire by "revolutionizing" education.

(Heck, IMO, it's incredibly unlikely that you're going to become the next Sal Khan or Kiva -- it takes a lot to convince those key someones to give you millions of dollars for social good as opposed to a known actor.)