I wonder what demographic is going from iPhones to Samsung/Android?
I can only speak for myself and possibly a few friends, but we're late 20s in paid employment seeking greater features/screen size/customisability and a faster overall experience. I switched from an iPhone 4 to Nexus 4. Another of my friends went over to the HTC One from an iPhone 5 and my brother's girlfriend (30s-something professional) went from an iPhone 4S to a Galaxy 4. We're all generally happy with our moves. While I would never discount Apple, there are certainly things Android does better (more intuitively and smoother). That said, there's no replacement for iMovie, sadly. In any case, the number of people I know switching from Apple is greater than the other way around. Perhaps it's due to stagnant hardware and operating systems? Maybe this will change with iOS 7 and new iPhone models. There was a time I'd have considered a move back, but the price is unjustifiable for me. £280 with no costly contract is too sweet of a deal. A £16 monthly bill is so nice. =)