What pressure is there to push for any of these changes? I see AI advocates discussing the concept of UBI, but I can't imagine a world where the United States would ever pass this sort of legislation. I mean, congress can barely pass a budget each year.

If you are correct, I expect corporations to reap massive profits while most Americans try to find a way to survive in a world where they are obsolete.

There is whatever pressure you bring to bear on it. As long as you are still living in a democracy your vote is the pressure you can apply. If the parties that exist won’t represent you, make new ones that will. Do something rather than deciding it’s both impossible and up to other people anyway.

I also don’t understand why UBI is desirable. Putting everyone on welfare means everyone is poor. This won’t end well, and it’s certainly not the case that 99% of the population will let a tiny number of people remove their income in favor of pennies for all. Political violence will come first, easily.