That's not historically what's happened though, is it? We've had plenty of opportunities to reduce the human workload through increased efficiency. What usually happens is people demand more - faster deliveries, more content churn; and those of us who are quite happy with what we have are either forced to adapt or get left behind while still working the same hours.
Jevon's paradox really does work for everything, not just in the current way people have used it this last week in terms of GPU demand. People always demand more, and thus, there is an endless amount of work to be done.
We don't have enough because the productivity improvements are not shared with the working class. The wealth gap increases, people work the same. This is historically what has happened and it's what will happen with AI. The next generations will never have the opportunity to retire.