[fictioncircle]

We are a long way from SkyNet and self maintaining robots.

Realistically, the robots are simply going to replace Fast Food workers and such like they do in factories. (i.e. massively reduced but non-0 employment) UBI assumes people work but not nesc. full time and sufficient to take care of all of their needs.

If it gets to the point where you have no ability to earn any money for anyone, well, no offense you are probably screwed no matter the government unless its very benevolent. The forces you are talking about are wholly independent of UBI's existence.

Frankly, the belief that "lowering UBI" will be tolerated amuses me because the US has a UBI-esque system for the retired and it has the largest, most powerful lobbying organization in the US.