This concerns me more on the iPad than the iPhone. I frequently have an iPad plugged into speakers while charging and I see a quality accommodating stereo or set of speakers as way more expensive than headphones.
Maybe an alternative could be some kind of Bluetooth dongle that could be plugged into my existing systems.
Airport Express
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So they don't have to include a free adapter in the box?
Based on Apple's history, the iPhone 7 will be the only device to come with an adapter.