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They are the only two sci-fi based game that don't have a huge flaw, and I believe it will stay that way even in the next 5 or so years. The upcoming sci fi mmos, huxley and tabula rasa aren't exactly what a scifi mmo fan would look for in a game.
Tabula Rasa, well, it hasn't been looking good for it so far, and Huxley is just a a massive fps, but i guess I can't judge Huxley until it actually comes out and people get a pretty good idea of what th game will be like.
There's always Star Trek online, but then again, that seems like a total pile of crap so far by what the devs are saying. Let's just hope Stargate Worlds delivers or all scifi game fans are going to be disapointed.