How are you going to miss someone you did not personally know or enjoy the modern works of? If someone out there enjoys stuff that he himself personally alone made past Dungeons and Dragons in the '70s, great, but you can hardly miss someone you do not know on a personal level, and I only postulated the works part because I am sure someone will bring it up, although I personally do not believe you can miss someone you just enjoyed the creation of (unless he had a daily blog or something I am unaware of, since that is daily and personable)
Also, the guy lived about the average life length, so I am sorry, but it pisses me off when people make a big deal out of people dying who enjoyed longevity. The people who die young or who die without ever having anything great in their lives are the ones who deserve the most mourning!