I imagine the MOOCs could replace intro courses where classes are currently over 100 students. For smaller specialized classes at the upper undergraduate levels

I imagine the MOOCs could replace intro courses where classes are currently over 100 students. For smaller specialized classes at the upper undergraduate levels (and K-12 with its lower class size) a good teach modifies how they teach depending on specific students and the class over all. We have had a mass system of learning without a teacher for 500 years. The printed book.