I think the answer is that by the time AI can replace every function you do, it's also replaced everyone else and the world will either already have or will need to change radically.

I personally hope that the future becomes a UBI consumer-as-a-job thing, minus too much of the destructive impact that current consumerism has on the world.

Try to think logically. If AI eats all jobs, then nobody earns money any more to pay for everyone's UBI. The rich certainly won't do it.