Great post. I think (at least in the US) there is a lot of cultural and political opposition to UBI due to the misconception that it's a free lunch for those who refuse to work. But especially as the jobs lost to automation become so prevalent that even skewed reporting of unemployment stats can't gloss over it, people with start to understand and it will enter public discourse.
Many of the trials also have rules on who is included to participate, but in a real world scenario there may be an influx of outsiders flocking into a jurisdiction where UBI is implemented to get in on the action. That would be a challenge to control if UBI was not truly universal (global.) And while governments are good at handing out money, they are not good at doing anything global (except for maybe war.)
But if the need is great enough, I think we can get there. Thanks, and again, great read!
RE: Is the World Ready For Universal Basic Income?