Prices will just go up.
How much free time you have could very well be a function of how valuable / hard to automate your work is.
You are sort of making my point; proposals like this assume that those who contribute "less" are less valuable - but of course that is only true on one scale.
As a though exercise; if someone is physically disabled to the extent they cannot work and need regular care should they a) live hand to mouth and unable to afford non-essentials? Or b) should they be comfortable and capable of indulging in luxuries.
Currently our society says they have zero value so (a). I argue that it should be (b)
I am assuming you mean "who don't work" when you say provide zero value. The poor encompass more than just people living in a cardboard box in some alley. There are poor people living paycheck to paycheck who are barely able to afford food AND a roof over their head. A poor person can be a single parent with two kids who works two minimum wage jobs just to be able to provide for their family.
It wears heavily on me daily.