Honestly? It just doesn't matter to me. I've been using Bluetooth wireless headphones with my phone since the days of the 5S, my last 3 cars have all had Bluetooth connectivity for media, my home speaker/audio system supports Bluetooth, and if I did want to use one of my regular headphones, I'd just buy the adapter. In the scheme of buying expensive Apple devices, of which I own many (5K iMac, MBP Retina, iPhone 6, iPad Pro, SS Apple Watch 42mm), it's just a non-issue.You can be outraged for days, I still couldn't care less about the lack of a 3.5mm jack.
Then speak for yourself, and stop making assumptions about other people's purchasing power.
You may be living comfortably with your 5K iMac, MBP Retina, iPhone 6, iPad Pro, SS Apple Watch 42mm, 3 cars, and wireless headphones, but not every "$700+ phone" owner has the money left over to afford even simple extra luxuries.
Many average people such as students on limited funds or folks living paycheck to paycheck but who save up for a good phone with high resale value will now be forced to buy something that before now was completely unnecessary. This could be a new overpriced cable for when the adapter inevitably gets broken (typical of Apple adapters) or goes missing, or it could be an even pricier multi-input adapter for when they want to listen to music at work or in bed as their phone charges.
If they can't justify the expense of either, they are left with the option of a phone without audio, or an alternative phone out of their familiar ecosystem and with low resale value.
People with your attitude annoy the shit out of me.
For me personally, having just bought a nice pair of Audio Technicas with a desire to use them as much as possible, the lack of an AUX port will be a bit of a pain in the ass.