Assuming that LLMs hamper gaining true experience and mastery of a language, and further assuming that LLMs will play a significant part in development (especially for juniors)… it seems to me that new programming languages and frameworks will have a significantly greater hurdle to overcome going forward, compared to what they faced in the past.
If we’re talking about a new language (as in, something that doesn’t have a lot of code available online to train language models), then it will have an impact on engineering departments. If new programmers struggle to learn it, it won’t be used. They might actually go back to Java because it’s easier to work with.