Seriously, I don't like this idea much. It may have some uses but it also fails to give the children the unwritten lessons in human interaction and socialization that they might get from a human teacher. I also think that if it is adopted by other education systems as a way to cut costs and the personallity of the machine was to become more autonomous than it now is, we could end up down the path of Aldous Huxley's Brave New World. That is not a good thing.