My personal feeling is that the scifi.stackexchange.com name is off-putting to fans of fantasy and not scifi, and that if the site had been inclusive from the beginning (or fantasy) it would be something else.
If others agree that it should change, what to? It needs to be clear (e.g. Cooking is cooking.stackexchange.com not seasonedadvice.stackexchange.com) and short (at most 10 characters, ideally under 8).
Updated summary: there was never enough momentum to get this altered (in particular, merging with the Fantasy proposal didn't seem to have any noticeable effect), and IMO it's too late to change scifi.stackexchange.com now (although I suppose going of the beta is the real deadline).
However, a fantasy.stackexchange.com alias still seems appropriate. Other sites have these (e.g. linux/unix, german/deutsch), so they are presumably acceptable to the SE team (who have been oddly silent about this so far).