The 3.5mm port is dying -- at least when it comes to smartphones. If the persistent Lightning headphone rumor wasn't enough to persuade you, the fact that Motorola beat Apple to the punch should be. Motorola's new Moto Z and Moto Z Force don't have that familiar circular hole for your cans to plug into, and it now seems inevitable that almost every phone within a few years will forgo the port in favor of a single socket for both charging and using headphones.
This is a change that few people actually want. It's driven entirely by the makers of our phones and their desire to ditch what they view as an unnecessary port.