My feeling is that it will either be too low to be meaningful or too high and it'll lower the production of useful things to buy, such that we're actually poorer in some sense in spite of it. I certainly agree with you about the fact that the production of the things we buy with money being more important than the rectangular pieces of paper, though.
So I actually think it can work out for a country like Norway, that's small and rich and which imports plenty of physical goods from elsewhere with oil money, and therefore where it honestly doesn't change much of anything. It's what happens when everybody does it that I wonder about.
But maybe I'm wrong and it will just end up outsourcing all the labor to China / Mexico / SE Asia / wherever with a manageable inflation and we'll muddle through somehow. I don't really know, which is why I'm disturbed that I see so few people who seem to have any good idea about the actual effects talking about it.
A simple thing to do to limit the unexpected economic consequences is to limit the size of the basic income. For example, give everyone $5 and you are unlikely to see any effects at all. Of course then the outcome isn't very interesting, but the basic mechanism isn't necessarily going to implode the economy.