I, for one, will buy it
As a person with poor eyesight, a larger formatted phone is exactly what I need.
I was planning to jump to a Samsung s5 because
1. the fonts are too small on the ip5
2. the keyboard sucked on on 3, the 4 and the 5. Just too damned small resulting in numerous typ-os.
3. a better device to watch videos than the ip5
I sincerely hope Apple is catering to this market. A sizable portion of the population wants a larger phone, so hopefully, they are listening. And if its too big for you, well, just don't by it. But my guess is developers are chomping at the bit to have more landscape to use to for their apps. Regardless, like their other phones...even the 5C, Apple will sell a ton of them.