This is the main thing that's been bugging me about the AI discussion. People seem to forget that capitalism is competitive, and if everyone gains the same advantage, then it's not an advantage. If the cost of labor goes down, it means companies will either need to lower their prices or increase their investment in other areas (e.g. hiring even more people now that they're cheaper).
Unless you're a monopoly, I don't see how AI will lead to these massive cost savings everyone is hoping for.