While I could fake outrage, I personally rarely ever use the headphone jack. The main reason is that my headphones typically have issues plugging into the port because I usually have a case on my iPhone. As a result, I typically use two methods for listening to music over headphones with my iPhone.
Also, in my opinion the Dragonfly provides better sound quality and also allows 96kbps files to play. The Dragonfly has a powerful amp despite its diminutive size, so you can drive pretty much any pair of headphones without even getting the iPhone's volume to the midpoint. I have a video that I put together if you are curious about the setup:
Does Apple Expect Everyone to Use this Frankenstein Setup?
So what is the point of Apple making this move?
(The tech media is constantly arguing that people don't want lighter, thinner phones. Personally, I don't agree with that assessment at all. Try carrying around an iPhone 6 Plus or 6s Plus in a pair of jogging pants or shorts. It is cumbersome, to say the least. I have made the decision to make that trade off for a larger screen, but I would prefer to make it less of a trade off.)
While I am not saying these changes will be worth losing the headphone jack for most people, I would make that trade off without a complaint because I don't care about the headphone port. Also, I bet they will have a pair of headphones with the lightning connector included in the box. I expect that they will also have some dongle available for connecting my regular headphones.
That being said, I do wonder whether they will have some option/dongle for plugging in a microphone that I own that runs off the headphone jack now. Unfortunately, I think Apple and third party companies will just come out with more products that can use that port and some of the old accessories will be useless.
One thing they have to do is make it more powerful, though. When I plug in my Dragonfly DAC without the Plugable hub, I get an error saying that "the connected device requires too much power". If they can't improve the power output of the lightning port, then it will severely limit the devices that will work with it. Most of those devices will require a workaround like the Plugable or some sort of battery power. Not ideal and it wouldn't give you any extra abilities you can't get with the current port.