And this ownership stake needs to be acquired while the human still has value to exchange for that ownership stake.
Expecting society to carry people who no longer can provide economic value to others is not going to be sustainable.
Lets imagine it happens - how is having 30 million rent -seekers sustainable? If all the actual work is done by machines, whats the point of their owners, what do they contribute?
Same applies to the existing owners of Uber and Waymo. If self-driving cars do take over the world, it makes no sense for this technology to be controlled by a handful of wealthy investment corporations, simply because they had the cash available to fund some of it at the start.
they contribute to the creation of the asset via supplying capital in the first place. And for taking on the risk of this contribution, they get to own their portion of the future output of said asset.
It does not work for many assets: land, mineral rights, etc. are risk free themselves and weren't crated.