Germany, for example. Yeah, sure, on paper you have to be "looking for work", but it's really on paper only.
> In an UBI society, those people could do something else and reduce the work load for everybody else.
They won't though. I live in a mixed income apartment complex, including lots of people on perpetual welfare with no desire to change their situation.
I keep reading about UBI from well-meaning people who explain how it will totally work and I believe that they actually believe that. I also believe that they have no experience with the people that live off of government transfers not because of necessity but because of laziness. It's enough for a nice apartment (50+ square meters for one person), a flat screen TV, an X-Box, a smart phone, internet, food, cigarettes and the occasional alcoholic beverage, healthcare etc included obviously. And that's enough for quite a significant amount of people. They won't "make the world better" if you give them more money, they'll just buy a bigger TV and throw more parties.
> At one point, you will be able feed the entire world from the work of a few persons.
Possibly. Let's talk about UBI when we're there. We're not, we're not close, and we won't be for decades, unless you're talking about 4 square meters per person and 2500 calories of nutrious slime with no extras. And nobody is talking about that.
Drop UBI and replace it with a job guarantee and you'll have my attention. That gets you essentially the same: everybody has enough, but it doesn't come with the moral hazards. On the other hand, it also doesn't reward the lazy.