RCS, the next generation replacement for SMS, has been around since 2008. It went exactly nowhere until the summer of 2018, when Google announced a big push to get it adopted by Android manufacturers and carriers. There was a bit of press saying how this would be great for everyone. Turns out, the RCS Chat rollout is a big mess. Hard to see this turning around and being successful.

And who sponsors a new chat infrastucture that doesn't support end-to-end encryption?