I guess theoretically humans do more complex work? Rather than screwing in a solar panel, humans supervise the robots that screw in the solar panels. Then in theory we'll have the same number of humans employed in the solar industry but 10x the solar installed per year. When spreadsheets came along we didn't have less accounting work, we had infinitely more. That being said I am very skeptical that AI will be the same, or that our society is in any way prepared for a rapid transition away from human labor.