Don't know how many "music players" you personally use, but I'm almost certain that your average person uses one...their phone. I mean just look around you and use anecdotal evidence...when was the last you saw someone outside of a music studio with headphones that weren't attached to a phone? Your personal use case notwithstanding, removing the 3.5mm jack won't effect the extreme majority of people. They will use the (alleged) Lightning headphones with their primary music player...their iPhones.
Worst case scenario, you can keep and use your legacy Earpods for all of your other music players.
True , my scenario is not an average one , as I am into my music.
My frustration is Apple fragmenting thier own products . Some have 3.5 , other lightning etc.