It's not dead and never has been, it's just shifted, like a magnitude 8 earthquake a number of times. Often with great destruction and many fatalities. Sometimes we build back better, sometimes we don't. I never bought into the dead Internet theory in the past, but with ai, I'm open to the possibility of most interactions online leading to a chat bot, in that way the Internet community dies, but still there will be an Internet.
Just like there will probably be humans even if we have a nuclear Armageddon, just a fraction of normal.
I'm most worried about the social contract between ai, search engines, and websites. How can websites provide valuable content if nobody goes to it, thus creating a loop causing most websites that run on advertising to die and that will definitely be a blow.
Tldr: is it dead? no IMHO, but it could become a ghost town with small remnants of community, however there is a chance for another shakeup, Ready player one becomes a reality and we basically socialize in VR worlds that aren't just voxels, etc but real world graphics thanks to ai generation.
It's both a scary and exciting time to be alive, AI can speed up technological advancement, maybe we get to the singularity and the Internet is the least of our worries. Maybe they not only cure aging but reverse it, as well as poverty.