I've seen a similar argument before: "If all jobs are automated, what will most Americans do for money?" IMO, that won't happen. If a company makes widgets, and no American can buy those widgets then the company will go out of business.
More importantly, and most enlightening, were the ideas expressed by Naval Ravikant on the Joe Rogan Experience. Ravikant points out that automation allows humans to do jobs machines can't: create. He said we are a
very long way from the sentient machines of science fiction. Machines are great for many tasks but they can't create, only humans can do that. It was one of the best two hours I've listened to on a podcast. Part of the solution is to spend more money training/retraining Americans into career fields not covered by automation. What we shouldn't wish for is a return of "old tech" job like textiles, human assembly line worker, etc. Let the Third World Shitholes have those.
It's on youtube, Apple and any podcast that carries Rogan's show.