Universal Basic Income can never happen under Capitalism. It's impossible. Were it to happen, it would literally collapse the system. Unemployment and the threat of such is the engine that keeps people in the wage slavery grind. Take that away and nobody would opt to be a wage slave as opposed to just coast on UBI and enjoy life. And even if not everyone took the UBI route, the remaining workers would have so much bargaining power, they would dictate terms to the bosses, and we can't have that.
Stop thinking UBI has any chance of happening in any large scale.
If UBI was only paying for housing and food, then why wouldn’t able bodied people seek at least part time employment to pay for luxuries? “Coasting on UBI” sounds like it would suck after a while considering that you would not be able to afford anything fun.
Personally, I have been happier in my life as a wage slave than I have been when I was unemployed and had my housing paid, but could never afford to do anything.
Because most people can have fun just hanging out with their friends instead of demanding constant consumerist luxuries, if getting the second would mean being a wage-slave and being grinded down by the bosses.
After a few months of smoking weed and playing video games with your friends, surely you’d get bored and feel like going to, say, Tokyo or Machu Picchu or somewhere (or taking up skydiving, or building the house you always wanted, or anything else that requires money). So you’d find work during some of your free time to save up for that.
So get rid of capitalism, the real source of most of our problems. I disagree on your conclusion that UBI can only have one bad outcome, but you're right that the opposition would not allow such a move because it takes away their power. So let's go after the core problem.