That is the thing, if they got robots to replace Indians and Mexicans and whatever hypothetical race they import, that would be an improvement. That also has historical precedent because labor shortage means investment in efficiency. Fighting immigration is not a "distraction" created by billionaires (unless again, you mean what Trump does with ICE that Kiwi Farmers clap like seals for), nor is it even exclusively a white supremacist or nativist cause. It is literally a tool for improving society. Might be we will no longer have jobs, but if it is all so hopeless the billionaires have already won and UBI techno-feudalism is our fate like you imply, then it would be slightly less worse to live in that system if we could maintain something like living in a coherent nation and not just a diverse hellscape.