There is no ever shrinking pool of jobs, and real wages today are 10x higher than prior to automation.
Instead, we do more with the same number of people, and invent new jobs that didn't exist prior to automation. Like Youtube star or computer programmer.
I'm reminded of the God of the Gaps argument - if you prove a supreme being exists by the existence of phenomena we can't explain, then that supreme being's space to exist is ever-shrinking as we explain more and more natural phenomena.
I think your argument is a kind of employment-of-the-gaps, but AI doesn't have to stop short of human capability, so there's no reason to think the gap won't completely close.