Signal is the world’s most widely used truly private messaging app, and our cryptographic technologies provide extra layers of privacy beyond the Signal app itself. Since launching in 2013, the Signal Protocol—our end-to-end encryption technology—has become the de facto standard for private commu...
Well, if SMS is dead then RCS is what we get instead, and there’s no difference to us (and probably higher costs for Signal & al.)
And there are wayyyy too many things that depend on SMS for it to be dead any time soon, too :)