> Unless there is an external factor which drives iPhone sales: the availability of iPhone software, which is not controlled by Apple. This software is develope

> Unless there is an external factor which drives iPhone sales: the availability of iPhone software, which is not controlled by Apple. This software is developed by external Pros. On Macs. I wouldn't say the demand for iOS apps is as elastic as the author thinks. The big push towards building for iOS isn't 'mostly people just playing around with xcode', but people actively pursuing profit off the market of users the iOS env has. Even if fewer MBP users led to a significant ramp-down in the number of unique quality-app devs in the app store (I doubt it), the big players and their apps would still be around, as would many more hopefuls trying for a slice of the pie.