This weekend my aunt got a room at a ery expensive motel, and was delighted by the fact that a robot delivered amenities to her room. And at breakfast we had an argument about whether or not it saved the hotel money to us the robot instead of a person.

But the bottom line is that the robot was only in use at an extremely expensive hotel and is not commonly seen at cheap hotels. So the robot is a pretty expensive investment, even if it saves money in the long run.

Public schools are NEVER going to make an investment as expensive as an AI teacher, it doesn't matter how advanced the things get. Besides, their teachers are union. I will give you that rich private schools might try it.