I’m sure that he/she would ride a lot more if it cost nothing, but I think the point is valid: even if Uber could 10x or 100x productivity, they could not do the same with income, because there is a limit to how much people actually need to go places.
That’s true but fully autonomous driving alone might double my car travel. Going into the nearest major city is a pain. So is driving into the mountains. Operating costs and time are still costs. But not having to drive would really change the game for me.