I agree with  that nothing in the links collection needs to be there.  The only criterion in Wikipedia:External links that seems likely to apply to this article is the last one: "Sites with other meaningful, relevant content that is not suitable for inclusion in an article, such as textbooks or reviews."  Even there I think more than one (representative) site is unnecessary.  This article is not an entire encyclopedia of sf in itself; it's just the main article from which many others will be linked.  The Worldcon link belongs in the Worldcon article; most of the others have nothing to add beyond what should be in the article itself.  They're not objectionable sites, but they don't fit the Wikipedia definition of links that should be included.