Why would I not want to communicate with people I personally know over the Internet anymore, or with people they can introduce me to?
It's "just" going to require better digital identities and authentication, whether for real names (for interacting with banks and governments) or context-dependent pseudonyms.
So, you'll only talk to people you know, probably in your country, facilitated by a government ID. How long before that turns into "you can only communicate using your government ID over the internet".
Who manages these context-dependent pseudonyms and what motivations do they have. Pretty much in any commercially operated publicly traded company this seems to turn into "allow spammers on the network in some forms to increase engagement".
It's "just" going to require better digital identities and authentication, whether for real names (for interacting with banks and governments) or context-dependent pseudonyms.