Work, in the form of a job, is the basis for our economy. If you provide work to someone with capital then you get capital in return. Critically, basic necessities are part of this economy, so food, water, shelter etc... are traded in the same markets as t-shirts, toys and printer paper.

What basic income proposes at it's root is attempting to decouple basic necessities from the larger market economy. The mechanism that this works through attempts to retain the structure of the "market economy" and in general terms would set the basic wage at the market basket rate for necessities. Previous experiments on this have been either limited in duration or scope and would be argued could not be extrapolated to an entire national or world economy.

I think however that fundamentally we will need to change our moral attitudes broadly to actually embrace the "post scarcity" world. My guess is that workers will be displaced faster than our systems can catch up.