Samsung has 0 credibility here because they just use Google messages and Google’s Jibe implementation of RCS.
If Google drops Jibe for something else, it means Samsung is as well.
RCS isn’t really a standard anymore either. Once Google put out their own proprietary Jibe implementation, everyone just adopted that instead of putting in the work to implement it themselves. All the carriers in the US use Jibe as their RCS backend, and Samsung moved to using Google Messages as their default messenger. And all RCS messages go through Google servers.
If Google decides to do something else and drop Jibe, like they have with every other messaging service they have had, that’s it for RCS.