I think there will be an ossification of current languages/frameworks/libraries. The technologies that already have a large amount of documentation, tutorials, example code, etc. will have a huge advantage over a brand new language because all of that content will be in the pretraining for all LLMs. Would you rather use JavaScript/TypeScript and Python (which will work relatively well with LLMs), or some brand new thing that will barely work at all with LLMs.

tbf that applies pre-AI as well.