As someone with high-end headphones and hearing aids that preclude earbuds, I will miss a headphone jack so much I'll probably get my first Android phone over this.
FWIW, there are MFI hearing aids with Bluetooth audio support (along with individual R/L volume control, profile selection and remote microphone support - seems pretty neat) that I've seen some people raving about on reddit. Rather expensive devices, but hearing aids in general are outrageously priced even for low-end models.
I have really good headphones but I just use the dongle. So I've never had an issue. Never lost the dongle cos I tied it to the end of the headphones with a small bit of velcro.
