Belief without evidence is faith. I’m “agnostic” here.

I have no data for neither, so I’ll wait for numbers.

Will LLMs stay being useful? Definitely. Will in 10 years touching/changing code be somewhat niche, like ASM development is now? Not clear yet.

And optimisations are not a given, a lot of low hanging fruit are already taken, because it actually saves lots of money already now.