Domino effect? Agree. The internet was designed to withstand atomic wars.
So in a nuclear war scenario, if the cloud of dust doesnt make this planet a giant ice ball... (We dont have too much data on nuclear winter... yet) is highly likely that the internet will survive as a series of regional networks all around the globe.
So, Im sure that lots of repositories we find here everyday full of Koikatsu characters and stuff are still going to be around in the post apocaliptic world one way or the other.
And so, the world ended but the gooning continues... And who knows, maybe one of us will goon to a future anime-representation of World War 3 incarnated as a waifu like they did with Ebola-chan.
And who knows, maybe kk.now.cc its still around those days... haha...