Nothing can kill a classic. As much as some people hate it, people cling to what they know. If you happened to not like it, well then you happened to not like it. Nothing else to say.
That's why there will never be a "Mario Killer, Metroid Killer, etc." They're classics. You can't kill them. You can only imitate structure and add different features.
That being said, some of the "classic" MMOs out there I'd say would have to be WoW, Maple Story, and Ragnarok.






