The progress of artificial intelligence shifts that. We can conceivably do without humans for almost all jobs, both high paying white collar and lower paying blue collar workers.
A good example of that is High Frequency Trading and black box hedge funds based on algos. Such trading now accounts for a pretty decent % of turnover. Hasn't dramatically affected employment and incomes as yet.
Probably a better example is the response to the min wage rise in the US where some fast food outlets are looking to automate more or less everything.







