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That’s hard to say. It seems pretty clear that a 4” screen has become something like a 32” TV - it’s an ok size….but a little small by today’s standards. On the other hand, that would require Apple to implicitly admit that they are following Samsung’s lead on screen sizes, when they have taken the position that 4” is the perfect screen size. They do have some points; easier to put in a front pocket and it’s easier to operate one handed, for instance.
There have been a number of reports suggesting that a 4.8” screen is to be expected on the next generation iPhone. This seems like a good compromise between the mega phones that look absurd in the front pocket of most pants and the smaller 4” size. As more and more video is played on iPhones thanks to Netflix, YouTube, etc, most people want a little larger screen.