I am pretty sure UBI will be at least tested at a large scale in our lifetime.

In the US, they can't even figure out universal healthcare, do you really think they are giving to go for UBI?

Huge numbers of desperate, armed, unemployed people have a way of focusing the will.

That's what Anduril is for

I am from EU, so I can see it happening here, or in some smaller countries. Here, you already sort-of have an UBI, where you get enough social benefits to live off if unemployed.