Ever since I built the product, people have been telling me SMS is obsolete and RCS is coming (4 years now). Google bought Jibe Mobile in 2015, if you go to the Jibe website and try to submit their "Get Started" form there is an error.
I have tried to get in touch with carriers to find out how to connect up RCS from my product (because hey, don't want to get behind the 8 ball) and haven't found any way to get it set up, even when asking my upstream providers.
I really don't think RCS is going anywhere, but if it is, it would be good to be able to build it into my product!