Because technologies, programming languages, best practices, won't stay frozen. If LLMs cannot catch up with it, I think it can be considered as a drop in capability. No?

Close, but no. What will happen is that "technologies, programming languages, best practices" will stay frozen because human innovation will drop, and the whole field will stagnate.

This is the biggest fear! I don’t see an easy fix.

Will the developer of a new programming language be able to reach out to model companies to give a huge amount of training data, ensuring that the models are good at that new language? I don’t think a small team can write enough code, the models already struggle in medium-popularity languages that have years of history. They hallucinate lua functionality sometimes, for example, even though I’m sure there is lots of lua code out there.

So if most people use coding agents, we’re stuck with the current most popular languages because no new language will get past the barrier of having enough code that models can write it well, meaning nobody adopts the new language, etc.

Same thing with libraries and frameworks - technical decisions are already being made based on “is this popular enough that the agents can use it well?” Rather than a newer library that meets our needs perfectly but isn’t in the training data