Maybe teachers can scale with technology? Maybe we see some of this with online courses, MOOC's? If that were monetized in a way to give the proceeds directly to the teacher maybe that could work? Although some teaching does not lend itself well to that environment, in some cases classrooms and 1 on 1 interaction is something that cannot be substituted.

I agree for all the examples you give, there's nothing clear like there is for athletes and artists.