The internet as we know it today is the result of years of technological evolution. Now we have the hardware and the benefit of hindsight to make creating networks much easier than it was the first time around. I am suggesting that once NN is dead, alternative networks of free information exchange are going to start popping up. The internet will fragment as necessary for free information exchange.
When discussing this ideas, people often get hung up on infrastructure. Remember that Puerto Rico is enjoying wireless internet infrastructure right now.
And keep in mind that a computer network does not need to support high speed communication to be a valid means of exchanging free ideas- which is what is really at stake with NN.