I fully expect the US to be the very last to switch.
At a country level it is much more difficult for people to come and go and countries have some control over who does come and go. It would be better tried by some European country.
I'm inclined to disagree. It'll be easier to implement in a place like say Canada or a northern European country where there is already wide acceptance of social support structures.
0-hour workweeks for everyone, the second robotic slaves are economically advantageous!