2. is unlikely because no one wants to pay for anything.
This whole idea is a very naive scheme to try to solve the obvious problem with welfare that there are large groups of productive people who pay for those who are not. It creates a great deal of anger in the productive group so if you can mitigate that anger then maybe you can continue your welfare schemes. I'm going to guess that this basic income would not entirely replace welfare programs.
I find it so interesting that there are so many things being proposed by people entirely ignorant of political economy and contradictory to the most basic understanding of the profession. Between this and this recent minimum wage increase nonsense it seems like we're hell bent on just saying "To hell with what econ 101 says, this sounds good to me!"
I keep hoping that the adults show up and just start ignoring all this and letting everyone know they're being ignored. I suspect that will not happen in this case. It never has before.