I think there's a piece missing here. Capital owners are humans too, and what humans want (perhaps especially the ones who accumulate capital), is to be at the top of a hierarchy. But a hierarchy needs participants. If nobody else is playing the game, there's no top to be on top of. Strip away the people willing to compete, admire, envy, or just show up, and the whole structure collapses. It's not clear that a world of pure capital-on-AI-labor actually gives them what they're after. It sounds lonely and meaningless to me. I don't think that it would feed the black hole in their chests.