> "iMessage is literally the single most important selling point of iPhones in the US."
Given the lack of emphasis Apple puts on iMessage in their marketing, it seems unlikely it's the single most important selling point. On the opening page for the newest iPhone, it's mentioned in a single sentence in a paragraph on Security down near the bottom of the page, hardly pride of place.
Granted, I don't see Apple opening iMessage for other platforms for a number of reasons, including product differentiation, but at least Apple seems to think there are many more features to highlight before getting around to iMessage.
