From MixPanel, here are the latest iPhone adoption numbers:

To get a sense of the potential market for a smaller screen size iPhone, add up:
– iPhone 6: 34.36%
– iPhone 6Plus: 9.07%
– iPhone 6s: 13.57%
– iPhone 6s Plus: 4.21%
That gives a total of 61.21%, leaving 38.79% of the iPhone market prime for an upgrade. Interesting.
My wife got so sick of watching me struggle to use my ageing 4S that she went out and bought me a 16GB 5S about a month ago. I was trying to hang on, but it’s too late now. It’s a good upgrade, it’ll do me another four years. Apple left it way too long to upgrade the 4″ phone.
I loved the 4S form-factor. That thing felt like the kind of phone I’d want to use. I use a 6 now, and the larger screen is great, but….