I think you have to look at the trade-offs of scale. McDonald's serves 58 million people EACH DAY (http://understandingbignumbers.com/how-many-people-does-mcdon

I think you have to look at the trade-offs of scale. McDonald's serves 58 million people EACH DAY (http://understandingbignumbers.com/how-many-people-does-mcdonalds-serve-daily http://understandingbignumbers.com/how-many-people-does-mcdo...) at extremely low cost. How does that affect the quality of the food and the experience? If Khan's method scaled (at lower cost) without sacrificing other features of high quality face-to-face instruction, then I would expect people who pay private school tuition (K-12) to push their schools to implement such an approach in order to lower tuition. But there's a reason why the elite pay $30K/year for K-12 private schools: Small classes, strong student-faculty relationships, high-quality facilities, and the exceptional educational experience that comes along with those features that cannot be replicated on a large scale.