If I remember correctly, each cone was an object the server had to handle (in order to make them have collisions) and was a big contributor to a lot of desync issues a while back. They would therefore have to be very limited in their use and wouldn't be as great of an idea as they seem to be. I can't see them being re-introduced anytime soon as the performance of the server means a lot more and any way in which they were changed would make them less useful and less fun.