This could be fixed in the iPhone 7s with the introduction of Bluetooth 5.

Indeed, after having that we just need headphones with reasonable battery life.

Or you could just buy two pairs instead.

What does? WiFi?

Also, as far as I understand they use a "wireless lightning" proprietary thing with the new wireless headphones.

I do not know what does, I am just pointing out that I cannot move over to BT as it is right now. I have all my music in ALAC and I am using a great headphone that has no alternative in post iPhone 7 Apple land.