You forget the emergence of the creator economy, smaller communities and the move to the early, syndicated nature of the early 2000s Internet. That internet has no problems with any of those. All of the issues you list were created by establishment actors for their benefit.
Early internet: As long as there was copper, you generally could exchange {protocol} (i.e. HTTP, FTP, POP3, ...) to {person} in {country}, quite freely.
Current internet: Many egress and ingress connections are banned by {government agency} of {country}.
Future internet: What parent comment was predicting: An increasing number of governments increasingly aggressively ban an increasing number of internet services (i.e. connections).
It's really not that hard to imagine, look at China or Russia or many other countries (e.g. Middle-East). Very aggresive white/blacklists of internet services.
This is the "fracturing" the parent comment is alluding to.
Part of the problem is people thinking that such countries are creating the fragmentation whereas it were the US companies who literally partitioned internet through algorithms, walled gardens, filters and blacklists. A national firewall can be circumvented by VPN and many do. Its much harder to circumvent whatever limitations such corporations that control large parts of the internet create.
In many ways they're _ALREADY_ more powerful than state actors. They were pretty open about their attempts at manipulating the last presidential election, and I personally think it was a gigantic mistake for them. It's only going to get worse imo.
It went well for them as long as they were on the winning side. Only after their side lost or they changed sides things started going downhill.
FYI, this can be quite difficult for certain countries. Source: I have had friends who live in China and the Middle East, and VPN IP addresses are very quickly found and blacklisted. It's not a one-size-fits-all solution.