Another possibility, that might mitigate the problem, would be to create a separate Wiki site for people who want to post fiction. As it happens, I've been toying with the idea of creating just such a site. There are people who *like* reading fiction and perhaps creating it collaboratively. Give them their own playground, and maybe they'll leave Wikipedia alone.
Well, I was referring to articles about fiction, not articles that *are* fiction. The latter are generally not tolerated on Wikipedia. A separate fiction-pedia (storypedia?) might indeed make sense, but be careful not to try too many projects at the same time. It's not like there's any shortage of fiction on the net ...
Regards,
Erik