I just upgraded from 6S to 7 plus 2 days ago, and I normally listen to music every day. We usually listen to music when we're commuting to work/school etc. and the majority uses either EarPods or similar earphones as they are easy to carry and their sound quality is not bad. I also have a pair of Beats Studio headphones that (as a result of the removal of the headphone jack -- as I was too lazy to carry the adapter with me) I haven't used since I got the phone.
In fact, the new Lightning EarPods (in my opinion) sounds better than the older ones, I have been using them all the time. I also have a pair of Bluetooth Earphones that I got for 25CA$.
Also IMO better speakers of new iPhones is a great replacement for the headphone jack.
Long story short, what I am trying to say is that as wireless earphones are getting more and more popular the 3.5mm jack is not that important anymore. And it's not like we cannot use our 3.5mm headphones, there is an adapter that comes with the phone.
In fact, the new Lightning EarPods (in my opinion) sounds better than the older ones, I have been using them all the time. I also have a pair of Bluetooth Earphones that I got for 25CA$.
Also IMO better speakers of new iPhones is a great replacement for the headphone jack.
Long story short, what I am trying to say is that as wireless earphones are getting more and more popular the 3.5mm jack is not that important anymore. And it's not like we cannot use our 3.5mm headphones, there is an adapter that comes with the phone.