Are you using SMS to chat? What about Skype? Google Talk? Facebook Messenger? WhatsApp? Viber?
I am sure you would prefer to use only one of them but are forced to use multiple. This is also what Google thinks how things would be.
The vision of WebRTC protocol is to reduce the fragmentation of realtime communication protocols and thus allow TV, phone and your computer to communicate on a common platform.
Development costs cut 10 times