There was an essay recently on HN on the merits of individual tutoring for children, in the spirit of Renaissance aristocrat education (not the exam-prep style tutoring that is common today). Projects like Khan Academy could make this extremely resource-intensive style of education a bit more accessible (not on their own maybe, but as a building block).

Edit: PS: just remembered, if there were orgs like Khan or other leaders in online learning that managed to become accredited by established programs like the International Baccalaureate, that could be very interesting for students, as it offers practically universal global recognition (as well as a very well-regarded curriculum).