I work in a school district where K-5 students have 1:1 iPads. This will mess things up a bit. Not sure what we'll do for headphones. Bluetooth? I'm sure bluetooth ones would be far more expensive than regular headphone jack versions, plus would probably need a different kind of cord to charge (micro-USB wouldn't surprise me), and students will probably forget to charge them. Haven't seen USB-C headphones, but I haven't really looked, either.
USB EarPods are a thing. Incredibly flimsy cable, but they're there.