On a roll now. Virtual sessions have been mentioned. There are problems with latency etc. but how about a virtual room where people can perform without the pressure of a live audience? Ok. You cannot join in but a skilful and sympathetic room admin could use it to help and encourage performers by inviting constructive criticism from viewers. A sort of virtual critics group :-) It may be better than the original as we would soon see which viewers should be allowed to comment and which should be kept on a tight leash!