Rinse repeat.
A lot of that has been happening for a long time now.
And, locally, there have been two ISPs set up (one by me and my friends) that aren't meant for public use, but to supply service to smaller groups. The one I set up was to supply internet service to a remote neighborhood that isn't likely to get reasonable commercial internet in the near or medium future.
Those two ISPs supply internet access, but they also operate an intranet that is mostly decoupled from the public internet.
All baby steps, and nobody is 100% "off the grid", so to speak, but it's a trend that started long ago and seems to be gaining a bit of momentum.
My prediction is that the web will ultimately be just for commercial use (it's already 90% there), and there will be a whole bunch of tiny networks -- that may or may not portal to the internet -- that will fill the needs that the internet is increasingly unable to fill.
We're not in a movie. When they close the open internet, there will be no reason for them to open it back up. Everybody's Playstation will still work. Facebook will still work. Twitter will still work, but it will be all blue checks.
In the future they may not even sell general purpose computers to the public that can access the internet. The network will kick them off as unsigned machines. Maybe they won't let anything on the internet that is capable of running illegal or unlicensed encryption.
The open systems will have to be physical places where we go meet each other, and don't bring our phones. Of course, they could make you carry your ID in your phone (for a few years, there'd just be a $100 charge for a physical ID until they eventually just phased them out), or make you carry cash in your phone, so how could you meet up in person if they didn't want you to?
If we're writing stories.
edit: I'm studying ways to facilitate decentralized decisionmaking in small permissioned networks.
Although in this grim future where all communication is monitored and censored, people like you and I will probably be up in the hills in the rebel camps, and open networking protocols might be low on our list of priorities.
…and they will make us use lead free solder.
Fun fact: You can no longer do such a project in software on stock Android. They locked down the voice audio API.