I think it would nice to have headphones that can detect orientation accurately and do positional audio. Probably a gimmick but maybe some of the VR headset technology will trickle down.
Speaking of, my first time in a virtual room with the Index was super convincing because of the sound, less so my poor 970 struggling to keep up. I could move around and hear the sound sources stay fixed in a physical (virtual space). Lean towards a speaker on the desk and it gets louder exactly as you move your head. Sound is definitely underrated for creating a physical presence!