if there's one field ripe for huge progress by a large swath of theoretical physicists invading it, it's probably educational research.
looking from afar, the quality of science there looks quite abysmal, while the field is very important (finding out how to make humans learn things better! come on!)
but maybe i'm underestimating the research
humans have invented mathematics surprisingly early (while the status of the number zero was still being debated in ancient greece), and programming surprisingly late (although algorithms were around for a long time, they didn't catch on until later, even though they seem like an at least equally intuitive concept?)
I operate by Crocker's rules[1].