The main issue is how fast those 5.1 people are moving on. Some of them are on iPad 1, so they will never upgrade. Other people are just indifferent to iOS up

The main issue is how fast those 5.1 people are moving on. Some of them are on iPad 1, so they will never upgrade. Other people are just indifferent to iOS upgrades, or don't have enough free space, or just plain don't want the upgrade due to the Maps and YouTube changes. Honestly, the main driver of the iOS 6 adoption at this point just seems to be selling new devices that come with it.