let me break it down even further since im at work.
Tablets, smart phones and computers have to talk to each other and sync across devices. Google, facebook, and Apple want a cloud system/cloud Messenger in which the user conversation is sync across all device. Why?? because they dont want you to leave their ecosystem. It makes for a better user experience and brand loyalty. My convo in GTALK, imessage and facebook messenger sync across the tablet, computer and smart phone. Try that with SMS. I wouldnt be surprise if amazion introduces a messenging client. Blackberry has new Blackberries coming out and BBM is their main selling point. The main advantage is you dont need cellular service for this to work, cloud messaging sync and the price 0$. If someone text you on your phone while you are using your tablet what would you normally do?? your answer is the reason it has to die