Yeah for sure but I think frameworks will adapt. It's like going back to 2002 and saying that it's better to program in Java because of all the IDEs available and all the corporate money being poured into having the best developer experience there can be. But since LSP arrived, developers choosing a smaller language suffer much less.
The 'LSP' that would allow new frameworks or languages to shine with coding agents is already mostly here, and it's things like hooks, MCPs, ACP, etc. They keep the code generation aligned with the final intent, and syntactically correct from the get go, with the help of very advanced compilers/linters that explain to the LLM the context it's missing.
That's without hypothesising on future model upgrades where fine-tuning becomes simple and cheap, local, framework-specific models become the norm. Then, React's advantage (its presence in the training data) becomes a toll (conflicting versions, fragmented ecosystem).
I also have a huge bias against the javascript/typescript ecosystem, it gives me headaches. So I could be wrong.
What I was trying to get at in the post is that net new experiences is where I see a massive delta