I think the most likely way Google dies is if web search itself dies. Maybe because something else replaces the "web" and Google failed to catch up. Much like

I think the most likely way Google dies is if web search itself dies. Maybe because something else replaces the "web" and Google failed to catch up. Much like how Microsoft monopolised desktop, but failed to capture the rising (and now dominant) mobile market. Maybe AI agents become reliable enough to a point where a vast majority of people looking for information will reach out to ChatGPT instead of searching on the web. Maybe all of the things we used to do on the web, we instead do in a handful of apps that Google has no access to. To be honest I'm not going to bet on Google dying off anytime within my lifetime.