You obviously have thought about this and care about the subject deeply. But you haven't challenged the assumptions behind the system. It's not that the system

You obviously have thought about this and care about the subject deeply. But you haven't challenged the assumptions behind the system. It's not that the system is broken, it's that the system can't handle the rate of change that individuals have to cope with today. The basic assumptions behind teaching in developed economies are still that of the industrial revolution. The system is good at producing graduates with basic literacy, simple math skills, will accept instructions with little or no question and sit or stand still for long periods of time doing the same thing over and over. It's not designed to do much more than that. The industrial nature of the system even borrowed from Henry Ford's assembly line. Students pass from one stage to another, and are exposed to a subject which they learn, are then tested on and then never see that material again or understand how it fits into the bigger picture. The only thing testing does is generate crude metrics. Tests don't actually measure anything other than the student has been able to pass that test. Sadly, when you are dealing with a very high student to teacher ratio, you have no choice but to rely on testing. There is no way around that. The higher the student to teacher ratio, the lower the ability of an educational system will have to actually educate or be able to determine if a student as been educated. Khan Academy doesn't address these issues, and Gates or whoever is saying it will, will be disappointed. But it is an interesting experiment that may contribute to something that does.