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.

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.