Fanfic is for the most part not verifiable, due to its extremely ephemeral nature, although I have supported a few highly notable fanfics getting articles - most memorably the Very Secret Diaries. Every planet mentioned in passing? No. I've also never said articles that are perma-stubs should be kept. I think perma-stub is a very good reason for deletion.
Well, perma-stubs are certainly welcome at fan wikis.