This isn't something the Scifi Stack Exchange can do on its own. Heck, our elected moderators can't even edit most of the help content. This change would require an appeal to the overseers of the Stack Exchange network itself
And sorry, but our Benevolent Stack Exchange Overlords won't break years of stable links for the sake of adopting a less memorable abbreviation that clarifies a distinction the majority of visitors probably don't care about. The cost/benefit just doesn't pan out.
An example of other Stacks with even more egregiously inaccurate titles: gaming.se is for video and computer games; for card games you'd want to use boardgames.se and for tabletop roleplaying games you'd want rpg.se--but if you ask about computer RPGs on rpg.se, we'll direct you back to gaming.se. Somehow, this still works out. Each site is clearly labelled in its banner, tour, and help, just like scifi.se is, to make the site's actual scope clear. We get confused people occasionally, but not often and it's easily fixed with migration flags.