Look at the history of farming. Tractors also don't go to disneyland.
Here you are talking about a shift taking employment out of the economy full stop — taking the money that would have gone to "a good chunk of labor", to use your words, and giving it to AI firms.
You are necessarily talking about job elimination en masse — it's the only way this hypothetical source of money is available.
If you take labour out of the market, en masse, you cause demand to collapse. Because they won't be economically active!
New industry after new industry has been created over the past 100 years. It's difficult to believe that all of a sudden that stops.