But I think of 3 demographics the most on this topic:
1. People with disabilities
A bit different situation, but one of my siblings is somewhat unique in their disabilities (I speak publicly about the topic), and their SSI money is not what you would call "rolling in it." They have still had to work very low level jobs to pay for their Section 8 housing.
2. Most people who are bad with money
Also, we're friends with more than a few couples who already receive hefty sums from the govt (for some reasons, understandably so); yet even at $150k in the South, they're unable to make it work. They are blackholes of money for kava, video games, eating out, Disney trips, etc. They're all useless people, in my not so humble opinion.
3. Entrepreneurial folks
Then there's my wife and I: no interest in UBI. We don't want it and wouldn't take it. For me, I enjoy what I do and don't like to be dependent on anyone, if I can help it. I grew up poor, so I want to remember everyday that if I don't apply myself, I won't eat.
Each of these demographics is going to respond differently. IMHO, #1 needs more support generally, #2 no amount of support or money will fix their problems, #3 I would get frustrated if it was forced on me, even by circumstance.
We're trending toward Saudi Arabia, where an ultra-wealthy class rules society.
This is already an order of magnitude lower than most other advanced economies.
I think it's true that Americans work pretty hard, but when given the opportunity will rather work towards early retirement or enabling a spouse to not work than taking leisure.
On the welfare front, there have also been huge expansions in the last few decades towards SSI and Disability payouts. It's not a UBI (since it's not Universal), but the future of the US would probably be an expansion of these existing programs to more or less provide the same results.
But, yes and for good reasons. UBI is easier to implement after you have fee healthcare and free education not paid from UBI.
In Finland we have free healthcare, education and guaranteed minimum income, minimum pension etc. But because it's not unconditional like UBI, it creates perverse outcomes where effective marginal tax rate for poor people can be over 100% and is often 80-90%. In that kind of situation UBI is easily tax rate neutral. Only thing preventing it is paternalistic attitudes.