Or the technological singularity happens before that, and either AI will kill us all, or humans will merge with AI.
On the other hand, on a much broader scale, the planet itself is a closed economic loop. There's a finite amount of resources and we're all just cycling most of them around back and forth.
Arguably, a significant amount of "growth" has come from taking resources that formerly were not "on the books" and putting them on. The silver in the New World wasn't in (Western) ledgers until the 1500s, the oil under the Middle East was just goo until the late 1800s. The uranium ore in your backyard suddenly got a lot more interesting after 1940.
New value can come from inventing new and useful applications for existing resources or by finding new external inputs (maybe capturing some of that radiation the giant fusion sphere overhead is blasting in our direction).
> You got this backwards - there won’t be need for humans outside of the elite class. 0.1% or 0.01% of mankind will control all the resources.
Let me rephrase that from 'So then there's no need for AI workers.' to 'So then there's no money to pay for AI workers.'
The UBI approach creates a closed economic loop: Company A pays taxes → Government gives UBI to consumers → Consumers buy from Company A → Company A pays taxes... This is functionally identical to Company A directly paying people to buy Company A's products, which makes no economic sense.
It's like Ford paying his workers $50/day, but the only customers buying Ford cars are Ford workers spending their $50/day wages. Ford would go bankrupt - there's no external value creation, just money circulating in circles.
Where does the actual wealth come from in this system? Who are the net buyers that make the businesses profitable enough to sustain the UBI taxes?
UBI in an AI-dominated economy can't create a functioning economy - it's just an imaginary self-licking ice cream cone.