Im all for getting rid of the headphone jack, especially if it's to help make the iPhone completely waterproof
The jack doesn't need to be removed to make the phone waterproof, the jack doesn't need to have any through holes in it.
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Why is a new design required every two years for it to be worth purchasing? They don't do that for any of their other products. Just because it looks the same doesn't mean it is the same.
It doesn't need to be different, but that is one more reason to make people switch. If they don't come out with some worthy features like shatterproof, waterproof, wireless charging, dual lens on 4.7" model etc then I'll skip my 2 year upgrade. My current phone is fast enough (iPhone 6), that coupled with the exchange rate and Apple not willing to shoulder some of that.
My upgrades were driven by
3gs -> 4 Retina
4 -> 5 screen size/ Apple Pay which is just coming to Australia today (but not my Bank)
5- 6 screen size
and by the fact my wife gets my old one
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Forever? I don't see anything else get completely redesigned every two years. People are just going to have to learn to be less superficial about their phones design because it isn't always going to be this exciting. It's not a new product anymore.
An those thing don't get replaced every 2 years so there is no need. The redesign is more about "fashion" I remember when I first got the Motorola Razr phone, compare the look of that to phones just 2 years earlier.
If screens become shatterproof, people won't need cases and looks will become even more important. (Still needs functional changes to get people to switch)