It's not a competitive field. Teachers won't get replaced as new, more efficient modes of learning become available.
Barely any western education system has adapted to the existence of the internet - still teaching facts and using repetitive learning where completely useless.
We got high quality online courses which should render most of high school and university useless but yet the system continue in the old tracks, almost unchanged. It's never been competitive and it's likely always been more about certification of traits rather than actual learning. Both - I think - are pointers towards rapid change being unlikely.