Bitmessage
Programs like bitmessage already exist. It is open, distributed, non-commercial. There are no key managers to put any pressure on. All communications are encrypted with keys known only to the two endpoints. Even traffic analysis is pretty hard, and message contents appear to be secure.
Bitmessage may or may not be any good. It appears to be secure, but has never really been seriously reviewed or tested. But even if it isn't, someone else can, and will, create something better.
This is security theatre at its worst. This will have NO effect on the serious criminals being used to justify it. All it would do is make it easy to monitor ordinary people, and small time crooks.
Personally, I have become convinced that all the Investigatory Powers Bill is really about is reducing the cost of routine police investigations so that the government can cut the police even more heavily.