One thing I thought of: I think one way to really make education stronger, and cheaper, by utilizing technology, is to have your "point system" based on teaching people just under you. By teaching material, you also learn it more strongly yourself. And of course you have more "one-on-one" time with students while actually reducing the demand for professional teachers.

So maybe you could start with something like Khan Academy (it doesn't hurt to have the lines, dots, and steps documented somewhere). But then have some sort of social network (and I'm saying this as somebody who thinks that too many things have social networks) based on the ability to learn and teach skills.