Re: Quid pro quo, Clarice...
WhatsApp has already gifted the alphabet agencies a backdoor to their users chats via a new 'feature' which backs up your chats to Google drive (unsure about apple version) totally un-encrypted. You might disable backups but has the other end you are speaking too?
Expect to see more of these crafty backdoor ways to your chats as well as interference with keys at the service provider end to give real time access/mirroring capabilities.