> jobs displaced by industrialization

This argument is cute and all, but ... does a data-point of 1 from 200 years ago really give us much confidence? We replaced physical labor with a massive service sector.

Now we're automating the service sector so now people can go to... eeh... the 3rd category of jobs? Seems like physical labor is the most stable career at the moment; what machines have not already automated is pretty difficult to replace it turns out. But we outsourced most of that to low cost countries except plumbers and electricians.

But will a population of plumbers really be able to maintain a population of plumbers employed?