And who is going to pay the bills for that?

No AI companies were able to make profit so far, and unemployed masses surely won't buy expensive ChatGPT subscriptions.

Will AI labs make profit from AI using companies? Hardly, unemployed masses can't and won't buy their products either, therefore they won't be able to afford even more expensive ChatGPT Enterprise subscriptions. (For crying out loud, even big corps like Uber can't pay all their AI bills.)

And if AI labs have no profits, how are they supposed to pay the hyperscalers for computing capacity? They will run out of investor money pretty soon.

And if hyperscalers can't rent out their data centers to AI labs, how are they supposed to pay for the electricity (gas/diesel/etc.) and water bills and repay their already enormous debts?

I honestly don't see how replacing all workers with AI could be profitable at all.

I do not disagree with you, but I think they will try to do it anyway

Meta is planning to use their own AI to replace their workers. They are spending hundreds of billions of datacenters. If they cut 30,000 workers thats around 15 billion a year in savings. Once their own workers are replaced they plan to sell their AI agents to small businesses for use on their platforms.