[nice_byte]

Eye tracking is already there.

Tobii showed vives retrofitted with eye trackers, and snapdragon 845 vr devkits with integrated trackers.

I tried both and it works really well.

I'm not so sure that it will completely solve the social interaction problem though. I've tried the demo where you can see your avatar in the mirror and observe the eyes move, but there was still something off about it. Maybe it was just the art style, but I suspect that eyeball movements are not the only part of equation - there's a lot of very mobile musculature around the eyes that tends to change the shape of the eye as people make expressions with their faces - and that part was not there in the demo.