MG Siegler responded to my post this morning about my feelings on Facebook Messenger and iMessage. The main question here is what happens to SMS when iMessage reaches 100% adoption. The answer: probably nothing.
Meaning unless iMessage is open to be able for use on every device, then SMS is a more open, and thus likely, a more popular solution. The Facebook Messenger approach is to create a standalone app that is on every major platform and use the massive user base to make the app popular.
Two completely different approaches with Facebook Messenger having the potential to have the most impact on the SMS industry.