So well, LLMs do not kill the web, eat it. We are still almost the sole valid source of data for LLMs.
What really killed the web are social networks as proprietary walled gardens instead of an open Usenet with a web companion for stuff to be preserved for posterity or too long/complex for a mere post. What killed the web is the fact that ISPs do not offer an open homeserver instead of a closed box called "router" even if it's a limited homeserver. With an open version, with IPv6, anyone could buy a domain name and publish from his/shes own iron a blog with a ready-to-write software, with automatic RSS feeds, newsletters etc. If we give such tool to the masses the original web will be back but it would mean free speech and giants/politicians etc have free speech preferring ways to master public topics through their platforms to hide from most stuff they dislike and push ideas they like...