I don't care if SMS goes away for good, but whatever replaces it should be a different universal standard that can/will be implemented by carriers. I'm not going to purchase a smartphone just so that I can use a fancy messaging app when my current phone already has sufficient messaging abilities.

Further, if SMS is completely turned down (and not replaced) so that there is no text messaging service for non-smartphone devices then I'd rather be without messaging capabilities than have to get a smartphone.