This seems neat in theory, it'd just be a question of whether it can feasibly be done or not. Are there any other MMOs on the market that have this feature outside of special events? This could be considered a "next-gen" feature for a MMO if so, which might make it a selling point for some people. I'm not expecting it to be in at launch or anything, but if it doesn't have a high development cost, sometime down the road would be cool.