[dzdt]

Sounds like an interesting book. From the linked review, the main thesis that many improvements from 1870-1970 are one-time-only events seems sound. I also agree with the assessment that 'singularity' theories are hokum. (That may be more controversial here on HN!)

It does sound like he might underestimate the effects of the coming AI/robot revolution. Over the next 75 years, any job definable by its output may be taken over by a robot. What is left are service and creative occupations where the human presence and artistry is valued. But this will entail a huge economic upheaval.

The other giant quality-of-life advancement that might be out there is slowing or eliminating the effects of aging. That would also come with giant problems of inequality (if it is narrowly available) or population pressure (if it is widely available). But it would surely be another huge advancement for its beneficiaries.