See, I'm not even coming at this from a position of somebody who needs the headphone jack. I have an AudioQuest Dragonfly Red that I use with the USB 3.0 adapter to both charge the iPhone and listen to my headphones. This was so far reserved for those moments when I really want to get serious about my audio quality. Even from this position, the decision to remove the 3.5mm headphone jack is so, so stupid that it trully boggles the mind. Apple's premise is rooted in a falsehood - that somehow the existence of the 3.5mm jack was holding back wireless audio development. No, in fact there is no known evidence of this. Over-reliance on a bad standard (Bluetooth) and the generall perception that MP3 (like) music is "good enough" is what is holding back the wireless headphone development. Without any evidence, that is a much more logical position to take. Manufacturers will always take the cheapest, easiest to implement tech that is passable to the target market and implement it. That's how 99.99% of companies out there think and work.
All we will see as a result of this is a proliferation of more bad audio tech, whether wireless or wired via Lightning (crappy DACs anyone?)