There may be many things said against it, but something like this IS desperately needed. The reason SMS has been such a success is that for decades every mobile device has supported it. You don't need to create an account, download an app, or buy a certain overpriced brand of phone - it's just there, and you know that essentially anyone with a mobile number can receive it.
Like it or not, RCS has come closer than anything else so far to achieving this, and there definitely appears to be some gain in momentum recently. Apple supporting RCS would be the next biggest step, IMO... I'd hope that they could look at Blackberry and see the future for iMessage.