Well, such a condition would rely on this being true and accurate. I'm not really confident there's any data that suggests how people are listening to music on their iPhone 7s at the moment, and really nothing to draw a conclusion from except "anecdata". The simpler explanation in my mind is that Apple wanted a thinner phone, and they did what they needed.
There was an article a few days ago from Xiaomi's Indian Product Manager who commented on the removal of the Headphone Jack on one of the Mi Phone releases. His insight was that despite what people say ("I don't care about thickness"), their surveys and testing overwhelmingly showed that consumers have a preference towards thinner phones.
With this in mind, to me it seems more reasonable that Apple just decided to ditch the jack less they be caught making the fat phone. Your personal preferences may differ, but I think the more reasonable and sustainable conclusion is simply that Apple is chasing the thin phone.