From the few teachers I've known I actually see the implications as the opposite. The teachers who made it to good schools (not their words but they're obligated to be a bit more polite) usually mention how they could almost do nothing because the kids are largely cooperative and will handle a lot of the lesson themselves once you've set them in motion. These are the kids you could probably just assign an AI to that's overseen by some kind of managerial equivalent to a teacher who meets with them once every week or two to be sure their ai lessons are going fine and hear out complaints.

The value proposition of ai instructors to me seems rooted in how they would free up more of the human teachers to focus on the problem kids at the low income schools where sometimes it's a good day if you got everyone through class without anyone threatening eachother or needing lesson concessions because they got knocked up. In the lower performance quartiles of schools teachers effectively become daycare/social-workers first and educators second and it's in this subsection I'd imagine a lot of benefit could be found in allocating more humans to at least shrink down class sizes so that problem students don't have such a pronounced effect on their peer group.