And one reason UBI is unlikely to ever really happen is that the few people at the top (who continually adapt the system to maintain their positions of dominance/wealth) exactly do not want the system to change. They especially do not want to democratize markets, lest they lose their positions.
UBI would raise the little guy, freeing him or her to explore more possibilities beyond the treadmill of survival. And that could lead to disruptions, and disruptions are bad for dictators/monopolists.
If jobs continue disappearing due to robots and software and are not sufficiently replaced by new jobs, then we will end up with a lot of unemployed, poor people. At that point, we will either introduce some variant of UBI or we will have civil war.
