Working out is one of those places that most people are willing to sacrifice audio quality for convenience of wireless. especially since in most gym's or workout places, there's a lot of ambient noise anyways.
But what about people who listen at work? or at home? there aren't really any decent affordable wireless headsets that come close to the sound quality of wired. at least not until you start getting into severla hundred dollars in cost. Nevermind the fact that many of us listen to music on other devices besides just our phones. our laptops, our stereo systems, computer system, etc. all using the 3.5mm audio port.
So while like usual, results may vary, when you consider that the 3.5mm oprt is so prolific that most people have multiple headsets using this port, and many people have extremely nice audio quality headsets that would be basically rendered obsolete because of the plug on the other end of the cable (and not an actual technilogical reason) it makes the change a hard pill to swallow by a lot of people.
I'm not against change just to be against it. But Apple needs to be able to showcase to me that dropping the port will have some tangible benefit to us. Apple will need to demonstrate that this is a GOOD thing, and that they had to do it in order to accomplish something.
if they drop the plug, and the only reason they give us is to make it 1mm thinner? than it's change for change sakes, and I dont buy it