Stale apples?
Even some of the most ardent fans of iPhones I know (including a friend who has a 6+ in pink rose gold....) are starting to get annoyed by what's increasingly feeling like 'me too' or change for the sake of arbitrary change.
On the other hand, credit to Apple where credit is due once you buy an iphone, if you keep it well it really doesn't lose anywhere near as much value as pretty much every other phone so trading up isn't such a burden as you might think.
I do however wonder just what posses people to queue for an electronic device though?