Well JS frameworks only stay relevant for a few years at best, so it is about time for it to decline. So what will happen next? Well it will get bloated, the next version will not be great, then the version after that will try to fix things... and by then a new framework will be popular. I am sure there will be someone that will create the next fad framework for JS and web... probably tied to ChatGPT, it would only make sense at this point.