these economic incentives for good code would also apply to code before llms no? And we have had plenty of shit code that stayed shit for a long time. I find this idea that economic incentives will necessarily drive the outcomes you desire to be akin to a religious belief for some people.

Yeah you could say the same thing about teleporting to Paris, or infinitely flavorful bananas. Just because the market would reward something doesn't mean it will come to be. There may be too many tradeoffs, or technical limits, or just that the future is 200 years away so you won't be around for it anyways.