There is a whole lot of brochure type web work that has disappeared, either to these site builders or Facebook. I don't know what happened to the people doing that sort of work but I would assume most weren't ready to write large React apps.
Why are you assuming that? How do you think all the new React jobs were filled? React developers don’t magically spring into existence with a full understanding of React out of nowhere, they grow into the job.
Sure it does. It’s not a guarantee, but presuming that a pattern is likely to continue is not nothing. When a pattern is observed, the onus is on the “This time is different!” side to make their case.
If you don’t accept that an observed trend says anything about the future, you shouldn’t make unsupported assertions in the opposite direction. They say less.
AI aiming to automate everything is something new. That's the point. There was no AI in the past similar to what is slowly unfolding now. Not even close. If you disagree with the word "anything" i used, then yes i understand i shouldn't have used this word.