But human labor does not actually need to be as expensive as it is. How cheaply could you house, feed, and clothe people? There are parts of the world where people get by on very little income. Of course we could aspire to better living conditions than the world's poorest, but that's what the robot revolution promises: abundance.
Imagine if AI suddenly was in more demand than human labor, simply due to the price. Excellent quality output for cheaper than somebody with a degree. What would be the second order effects?
Human labor, being in less demand, would have to lower its price to compete. This is the death of the middle (and lower) class future we fear. But ironically the price of goods and services would lower as everything, even complex engineering, medicine, construction becomes affordable. With the right policy, human labor becomes cheap again. Maybe even competitive to machine labor in some niches. Improvements in machine labor could have a compounding effect on how affordable it can be for humans to survive.
So where's the gap here? Well, most wager earner's income worldwide goes towards housing. Food and water and medicine can be bottlenecked causing price gouging. Monopolies and lack of competition in the market can raise the prices of things until everybody is spending all of their disposable income on necessities. I think the price of human labor is currently very high (in the developed world) due rentier capitalism.
The transition will upend much of our economic investments and probably involve a great deal of human suffering until nations figure out the right mix of solutions.