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.