As a student, I'm just going to say that it's about time somebody did this. Even going to an extremely high-quality school, Salman Khan is just a better at explaining concepts than your teacher. And that's okay.

Just consider this: If students statewide are failing to understand a concept, new videos can be A/B tested in its place, and you put the winner into practice. You actually have the potential to optimize teaching, at high scale, for what helps people learn. That's a huge step forward for everyone involved.