> Matrix, Signal become mainstream

Which one? These two are not compatible. Besides, Signal I can see, but a possible Matrix mass adoption is probably still years away. Experiences from previous years have shown that there seems to be no incentive for a majority of users to move to decentralized protocols. Unless either WhatsApp or Signal adds compatibility, that is. Does not look like it's happening any time soon though: https://community.signalusers.org/t/make-signal-use-matrix-p...