A few other tid-bits:
Business Case:
Potential customers are nearly endless since all businesses need customer service and even the smallest are now offering live chat. The market is extremely large as proven by the volume and size of current live chat companies. There are many ways to find an initial customer base; builtwith searching for businesses using the various live chat services and reaching out to them, YC’s network, acquiring a live chat service, partnering and integrating with platforms such as Shopify, etc.
Issues:
SMS/MMS has a cost per send. With volume this cost is very low, but still real. I believe this is a cost of doing business that is worthwhile to improve customer satisfaction.
There are others working in the same area. Intercom.io is kind of on this track. They have the platform to integrate the channels, but they don't have all the channels.
Test:
I took a couple of hours and built a quick SMS/MMS demo using the Twilio API and tested it with some friends - playing out customer service situations. It felt great being able to use the standard text interface I use all day long to get service. I was able to send images, video, pickup the conversation on my macbook (messages), etc. A small taste of the vision, but it was very nice indeed!