I think the endgame is you go to Google or your favorite subscription based LLM for knowledge instead of visiting websites. Ads can continue living within LLM search results and it can even become a marketplace where you order within the LLM environment.
I feel like this is a scene from a movie where a character goes "what are you talking about? Look around us, it's already gone" (idk why i am picturing Mark Whalberg for some reason).
But it's all just reddit, medium, twitter (twitter pages, w/e those blog things are).