This is exactly why I sold my iPhone 5 and switched to the HTC One. I'm disappointed by the screen size.
It's not that I think Android is the better OS; it's that the iPhone is just small now. I don't need a screen size like the monstrosity that is the Note 2, but the 4" on the 5 feels cramped when I compare it to the 4.7" on my One. The extra .35" on either size makes a difference, and this is what disappoints me about the iPhone 5S or C or whatever its called.
Apple says they want to give their customers the best one-handed experience, and I get that. And maybe I just have giant hands, but on the One I can reach the top apps without straining my thumbs. I get that not everyone has my sized hands, but my point is the one-handed argument isn't what it was in the past.
It's been a challenge getting my iOS ecosystem ported over to Android, and Android is a hell of a lot less convenient. But here I am, looking at my One, knowing full well that I'm settling for it, but what else can I do? The bigger screen on this phone makes a huge difference. And that's not hyperbole.
Maybe the 6 will have a larger 4.5-4.7" screen. I hope it does. If it does, I'll happily come back.
This is my problem with posts like this.
iPhone is the perfect size for what it was originally designed to be. A phone.
Not only a phone, but a phone that bucked the trend of micro sized phones. My non-iphone mobile in 2007 was so tiny and slim it is remarkable that I now have (and accept) a phone larger than my some of my first handsets.
In short, it is a phone that allows access to email and casual web surfing & multimedia etc, it cannot and is not designed to replace a computer or laptop (or dare I say... iPad?).
I think most users would still like a phone to fit comfortably in their pockets, rather than a much larger footprint.
I am not opposed to Apple releasing a larger phone as an option, just that I prefer the current size and do not feel that complaints as to it's size is a legitimate reason for abandoning the platform.
If like myself it sounds like you need a larger screen on the go at times, then like me you may have simply needed to buy an iPad mini. Otherwise good luck with your current platform.