Don't forget all the music and movies that you've payed for in one market or another that you might not be able to transfer easily to your new device. Building a complete consumption ecosystem was very smart of Apple and it's why Amazon has grabbed the lion's share of Android tablets with a pretty lackluster debut.

Yeah most music is DRM-free these days but as far as most users know, their iPhone knows how to talk to iTunes and their other phone doesn't, end of story.