That said, I wouldn't completely discount it as a possibility. If Apple removes 3D Touch that could give them some extra room, and Apple does still sell iPads and an iPod touch with a headphone jack, so it's conceivable they might decide to put one on the SE as well.
1. You can get 3rd party adaptors that also supply power.
2. Wireless charging pads! This is perfect for when your phone is plugged in next to speakers.
3. AirPods. I still use wired headphones when I'm doing audio stuff (b/c of latency and sound quality), but for every day listening they are great.
That excuse as been thoroughly debunked, since Apple no longer includes a headphone port on iPads either. It was purely a financial move to sell their own wireless headphones, after they bought the "Beats by Dre" brand name.
Keeping an eye out though!
I am planning now to get rid of the X and switch to the next small phone from Apple