I don't disagree (notwithstanding the extent to which we're already in a "world where corporations and the extremely wealthy suck up all the economic benefits and we're left with massive wealth disparity").

My point is much more narrow (and simple): that there is a subset of low-end jobs which are currently unautomatable due to their nature, and this will likely not change via the GPTs. This may (tending to will, given sufficient time) change via other technological advancements.