Comment by aeternum

Idk I think the plow still has similar scaling. You can make a much bigger plow now maybe it replaces 40 humans. You could make it bigger still and have ox pull it, now maybe 400 humans since you still need one to lead the ox.

Farmer Joe then claims he can train ox + border collie teams to eliminate the need for humans entirely when it comes to plowing. But by that point no one cares because the cost to plow a field is so low that it really doesn't matter, other things are the bottleneck.

The cost of things where AI can produce value will trend downward and human labor will move to other things, like entertainment, services. IMO there will always be demand for things like human-given massages, human chefs, human teachers, etc.