This is a bit of a tangent, but since this is tech oriented community I think it's relevant. It's highly likely that one day strong AI will be able to run the entire world economy, and humans will not longer have to work, nor will they be needed. At that point humans will need basic income to survive. In this scenario, the whole concept of "the economy" will have been stretched and squeezed into something entirely unrecognizable, so the problem of basic income being a drag on the economy will be irrelevant.
We are getting closer and closer to this point every year. Just look at employment figures. Computers are replacing humans in the workforce, and they will continue to do so at a rapid pace.
Basic income will be useful and needed, it's just a matter of time.