I'm skeptical that the majority of "conveyor belt workers and janitors" (or the people who would have wound up being such workers if we're talking long-term) ar

I'm skeptical that the majority of "conveyor belt workers and janitors" (or the people who would have wound up being such workers if we're talking long-term) are going to otherwise be trainable as "teachers, custom builders, physical therapists and nurses". Maybe. But maybe not, and the effects of the more qualified people retraining into those 'in demand' skills en masse isn't going to be that pretty in terms of its effects on wages and employment of those areas either... and this doesn't even reflect the fact that there will be a 'continued crisis' of automation in other areas, so you might retrain into the wrong area and find that job has gone before you even get started (spilling even more qualified people into the hunt for the next viable job category). I think you have some good points, but I think the tone of optimism is probably misguided.