People expect to be able to charge the headphones they use for their phone the same manner they charge their phone. I suspect they'll be quick to change over such accessories once they change the phone port - they have had several smaller revisions to the non-pro AirPods, such as adding support for wireless and MagSafe charging cases. We will likely just be able to buy a new case when that happens.

The real surprise is that the mice, keyboards and trackpads haven't gotten a meaningful update in a long while, so there's no USB-C on any of them. You'd think they would have long ago decided to switch those to USB-C, since the computer ships with a C charger - and because they could justify removing the bundled cables from the packaging.