For that matter, there might be different wikipedias devoted to specialized topics: e.g., a "litipedia" devoted to literature, or a "medipedia" devoted to medical information.
I'm not saying this has to happen or that it should happen, but I don't think there's any reason to assume that it *can't*.
Ah, the "victim of its own success syndrome" rears its ugly head at Wikipedia...-Stevertigo