Earlier quoted context omitted.
We already automate things and amplify somewhat the power of a teacher... We've been trying computer stuff for decades (and books before). You still need tons of teachers.
Also, what are books if not "automated" method of teaching...
https://en.wikipedia.org/wiki/Learning_by_teaching
Having been thorough some schools I think the biggest impediment was that teachers didn't really get what I didn't get, my mis-conceptions.
A recent student might be able to better understand what the obstacles in leaning might be since they have been through it themselves.
The idea of Learning-By-Teaching seems to be that students learn better when they try to express the subject matter so clearly that others can understand it too. But it might also compsensate for the lack of teachers, that students can be teachers to other students.