Next iPhone to Have Worldwide LTE Support

600,000 + .
That's the amount of applications Apple has.

$1,000,000,000.00-
That's the amount of revenue their ecosystem has generated.

2
On average, that's the amount of hard resets I've do on my "daily driver" Android hanset a month. (An HTC One X, Galaxy SIII, Galaxy Nexus, HTC Inspire, Nexus One (AT&T) in that order.)

Absolutely nobody else comes close. Google Play is somewhat close in the number of apps, but the quality is dramatically inferior to that of iOS. You can look at phone sales (there are more Android phones sold than iOS phones), but at the end of the day, it is an ecosystem game. Apple's building a content/application ecosystem above all else

A radical change puts them back at square one. That's what's hampering WP8. Android isn't exactly doing well, either. Although there are improvements to be made, the truth of the matter is iOS gets the basics right even after 5 years, from text selection (truly abysmal and inconsistent on Android and a mess in WP7), to copy+paste (about a billion times more powerful than Android and WP7's) , to the basic core of the OS (There's a reason Infinity Blade made iOS its priority.