We're not quite there yet. Even with offsets by eliminating virtually all other social programs, including socialized healthcare, and slashing the size of military expenditures to almost nothing, doing every single good idea there is to fund it and increasing taxation on the owner class, there simply isn't enought GDP to support it without spending your way into inflation... not unless you're a country with a very small population rich in natural resources.

It's plausible if we can bring the price of energy down to the point that it's negligible and multiplies productivity almost for free.

We need scalable commercial fusion power to make it work, basically.

I agree with the goal,l. I don't think people will contribute less without the threat of being unable to meet basic costs of living. I think a lot of people's contributions to society aren't adequately captured and recorded by our economic system.

But I'm not naive enough to believe that it can meet all of a person's cost of living with current tech.