tl;dr: I think this could be a very useful service, but the execution is very important. There are already services which are in this space who are trying to g

tl;dr: I think this could be a very useful service, but the execution is very important. There are already services which are in this space who are trying to get it right (olark.com comes to mind). I'm not really sure what the right way is, but if I had to take a guess, the experience should feel very homogeneous with the app which offers it. Yes, there's a reasonable amount of value you get out of a drop-in service that you don't have to configure or think about, but I think every point of interaction with the customer should be a carefully-thought decision and not a white-label feature you add as an after-thought. I think if you were able to figure out how to construct a communication's channel that could be easily added to an app while neatly integrating into the existing experience, that would be a major win that I'd give you money to provide me.