> Do you believe people will be able to sustain their incomes at current levels if A.I. does most of the work?

Does not matter, UBI will make the situation worse.

And that "AI does most the work" is yet another fairytale. AI does the easy work, leaving only the much more difficult and the controversial work, exactly the work nobody wants to do, due to the responsibility attached. So, AI will do that, and AI will do that with a preference for the wealth class.