Vinod Khosla writes,

I was asked about a year ago at a talk about energy what I was doing about the other large social problems, namely health care and education. Surprised, I flippantly responded that the best solution was to get rid of doctors and teachers and let your computers do the work, 24/7 and with consistent quality.

Most of the article is about health care. I think that the point is equally valid about education. A lot of education is feedback: the test gives the teacher feedback on what students are not learning individually and collectively. Right now, a computer could grade a multiple-choice test, but such tests offer only limited insight into how the student is thinking about what you are teaching. As computers learn to grade short-answer questions and essays, the real revolutionary possibilities will kick in.