the technology is there and has been for a while, problem is it sucks for the punters and it sucks for the DJ. Customers in commercial clubs and at parties want to be able to go up and talk to the DJ, request their favourite song etc.Yes you could do that with a webcam, but it's not the same. From a DJ's perspective there's nothing worse than feeling disconnected from your crowd and this would massively exasperate that feeling.

hell, the technology has been there since the invention of the telephone.

I agree the experience would generally suck, but there are cases where it would work, either as practicality (save on air-fares) or as gimmick. The DJ for your chillout room is up a mountain in Nepal; as well as the music, the scenery is projected onto the wall. Everybody feels peaceful by proxy.

I meant that the bandwidths are available to give the remote DJ enough immersive experience to do his job well. A couple of hi-def video streams and a high quality sound stream. I'm not going to develop it, I just noted it might be in the realm of the doable now.