One of the biggest concerns I hear about UBI is where the money comes from. I think think your point about eliminating the welfare state systems is a big part of the solution. Think of all the bureaucratic cruft that exists right now and how many of those resources could be diverted into more impactful areas such as paying for UBI that enables more to participate in the economic flow of goods and services. It's easier said than done, but I think a lot of the UBI's implementation costs could be covered by consolidating expensive and complicated systems into a simpler solution like UBI.