I'm pretty ambivalent about basic income, although I think it's probably worth a try. Not a version that replaces earned income though, there are too many obvious perverse incentives for such a system, it must be supplementary. On the one hand I can see a lot of positive effects from it. On the other hand one of the biggest downsides is that now you have a very strong divide in terms of citizenship, which could potentially drastically change the dynamics of immigration. Personally I'm very much pro immigration and I think the fact that people from all circumstances have the opportunity to earn substantial benefits from their work by moving to the US (or the developed world in general) is one of the most positive aspects of this country and part of its life blood and character.