Earlier quoted context omitted.
That also further increases the interoperability problem though, if I can't use my headphones with non-Apple devices even after going through the pairing dance. (Unless Apple uses some other open protocol, which I doubt!)
If Apple does go proprietary you won't be any worse off, assuming they still support Bluetooth (and I'd be very surprised if they stopped supporting Bluetooth).
I always wonder if the removal of the headphone jack was a ploy to get iPhone users to use Bluetooth so the find my network worked better..