And we know now the government has already been working to build back doors into all these opt-in services. However, contrary to what you say, it is arguably not opt-in. It is becoming increasingly infeasible not to leave digital footprints. And if you make the effort, then you automatically red-flag yourself as someone who is behaving like a terrorist or meth-dealer.
To get a job your employer might need to see your Facebook history.
It's coming, it's just going to be decentralized and (arguably) opt-in.