@nprofile1q... I'm pessimistic up to the point where you have to have to assume it will fail completely. Just as XMPP and MAIL failed.
The only encryption implementation with success were the approaches where the UX can be controlled centrally.
For MAIL there is
#autocrypt now, it is astonishing of good it is โ but email is still not encypted today.
XMPP/Jabber has OMEMO, but stillt struggles with client adoption and it isn't omnipresent.
Where it worked:
#DeltaChat and
#Signal both using a central library that can make sure encryption reliably lands at peoples fingertips.