> UBI assumes a sort-of Star Trek utopianism whereby production is severely decoupled from labor input.

No, it doesn't.

A mature (sufficient to live reasonably comfortably on its own) UBI probably needs a significant revolution in productivity to be sustainable, but UBI does not rely on production being decoupled from labor input (in fact, one of the arguments for it is that, compared to status quo systems and other alternatives to them that have been proposed, it provides better capacity for worker retraining and realignment of labor to meet changing needs.)

I thought "sort-of" was enough weasel to imply "significant revolution in productivity." :) See what you've done? Now I'm thinking about how you could construct a feasibility model :) In my case, probably "badly."

Hell, get all the status-seeking crap outta work and you'll probably have better results. Yeah, right :)