You literally only have one question, the rest of it is opining.
You're assuming a wage labor model and that people working twice as efficiently and at half intensity would result in decreased production.
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wage labor models aren't universal
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there is no reasoning stated for why production would go down
You're assuming people would have to be fired to maintain competitive growth. This is based on the logic of firms competing to capture market share. There isn't really a rational reason for this to need to happen under systems were the point is to accommodate human need, not to maximize profit.
Thats it interesting scenario, but why are you assuming that there is a significant segment that won't want to learn, especially when they're no longer alienated from their labor? And why are you assuming that the total laborers will increase with new technology, when you can retrain existing workers?
I dont think your scenario is realistic, it kinda reads as really misanthropic