Uber Eats also used to be dirt cheap. Surprise! it's not anymore.
And even if you just pay API prices for Opus - as opposed to using a subsidized subscription - you can easily reach the point where the tokens for AI-generated code become comparable in price to just paying a junior dev salary for a manual implementation. AI is great for greenfield projects, where there is little to no existing context. But on real codebases, people memorize large parts of it. That allows them to navigate files with 100k+ tokens in them. (Wherease the Opus API will charge you $2.5 for each time the model runs through 100k thinking tokens reviewing your file.)
But what AI can imitate pretty well is the result of having a clueless middle-manager review your code. So my prediction would be that the AI "revolution" will slim out management layers before it'll reach actual developers.