at every school in the world, there are kids that need help with math. Even at MIT there will be some kids that have been memorizing formulas... that's simply because that's how they've been taught for their entire life. Then they hit a wall and they're really in trouble.
Thrun can't teach kids that have, for a decade, been learning how to memorize crap. How many math teachers in high school and middle school can prove the pythagorean theorem? That should be the survey that we worry about.
Thrun should be making courses for fifth graders also if he wants to teach 20 year olds intro to stat.