That is... unless the predicted "AI Robots" come to pass, then many plumbing jobs could be done by the "plumber robot" [1] instead.

[1] it is doubtful we will see one anytime soon, but the possibility is there.

Mostly just because programming will be devalued.

Plumbing won’t pay well either once everyone and their mother floods the fields. Physically work like that lacks some of the aspects that kept software high paying for so long.

In the future, there will be work, but it won’t pay anything, because the pool of competition will be massive with so much unemployment.

Those who have true talent (high IQ) may be allowed some social mobility, as it’s better to capture that than to let it rot amongst the unwashed masses, but for the rest, life and status will be defined and immutable.

When they are not many high paying job, more people are inclined to learn to fix the stuff: DIY HVAC, DIY Plumbing, etc. Private Equity purchased many trades and jacked up prices. This will force many non-trade folks to learn more of DIYing.