This has never happened? Of course it has happened. There used to be buildings full of telephone switchers, did those jobs come back? We replaced horses with cars, the horses also never came back, and now we're the horses being replaced. I'm frankly somewhat bored trying to even recall every single example from history at this point, every time this myth about how "it always turns out fine" comes up. Survivor bias is a b**ch. "I wake up every day alive, therefore I'll live forever". Makes as much sense.

Maybe in 50 years some electronic brain LLM human-like androids will be posting here and saying "See, it worked out, sure, organics no longer exist, but we're humans as well, just more modern humans. Tech demand goes up every time. Lots of jobs!"