You've spent your whole life living in a society where that's already happened. 1000 years ago nearly everyone was employed in agriculture. Now nearly all those jobs are automated.
So you tell me: where are the consumers? Why aren't we all unemployed and unable to afford to buy anything now that those agriculture jobs have been automated away? Or did we find other productive activities to spend our time on?
This sentiment is constantly echoed on this site -- "just look at past times where tech removed jobs, this is no different". But the difference now is that we will soon have super-humans in terms of intelligence, dexterity (robots), and cost (cheaper, no healthcare, etc.).
I put the onus on the yay-sayers, can you name a job that a human can do that this new AI / robot cannot (or will not soon) do? Otherwise, I think its time to stop drawing false equivalence with agriculture, luddites, etc. Those were "narrow" machines, incapable of coding, writing a symphony, or working in a factory. In the next decade we're talking about building a better human.
I think a better example is to draw a parallel to horses. There is nothing left for them to do; we keep a few around for sport and entertainment, as a novelty. At one time, they were indispensible, but there's no rule that any organism (including humans) has infinite economically viable uses. At some point, everything worth doing (economically) might be automated to the point that human labor no longer makes sense (and hence we have high unemployment). There is no cosmic law written that "if jobs are replaced by tech, new jobs shall fill the space!" Just look at areas in the rust belt where literally nothing replaced the lost jobs -- there is just rampant unemployment, black market dealing / drugs, and despair.