Despite not being within the bounds of Wikimedia projects, certain things can still be useful for other non-Wikimedia projects to pick up in the future. To accomodate such pages, we could start up a "waiting room" wiki that would reside there until they can be exported somewhere. For example, let's say someone writes a very crufty article about The Simpsons. However, if there isn't a Simpsons-Wiki yet, then the page can be exported to the waiting room wiki in the meantime. This way, when a Simpsons-Wiki comes to existence, they can search through the waiting room for content they can use. They can then export it (conserving the edit history) and import it onto their wiki.
Another example is if someone writes an article, say, "List of sex symbols." Obviously not within Wikipedia's goals, however may prove useful for someone else in the future. In the meantime, it can be exported to the lovely dumping ground that is the Waiting Room Wiki. Once someone starts some sex symbol project, they can export the page and use it.
Keep in mind that this is not a Wikimedia project like Wikinews and Wiktionary are, but something more like the Incubator which is used for our purposes.
Cheers, MessedRocker. (Or James Hare)