Every time we try to come up with a Sci-Fi FFRP, nobody seems to want in, or we make it focused too much on 'Hard' Sci-Fi, which is not really any fun. There's also the problem that space is really big. There's so much space for players to be nowhere near each other, which also isn't fun when there's already few people.
I do love Sci-Fi, though.
Also, pre-emptively choosing title for WoTitP: "Thread 50 and still nothing has happened"