Of course headphone manufacturer's don't care. Maybe, just maybe, it'll impact the market of IEM's a tiny little bit.
The iPhone is a very insignificant device in this market. Headphone manufacturer's existed before the iPhone existed. They existed almost 50 years before Steve Jobs was born.
It's not as if the entire world of headphone makers will go down burning if Apple removes the headphone jack. Apple, or someone else, will make an adapter, or the Apple fans will stick to Apple earpods and Beats headphones, convincing themselves that nothing better exists.
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