Also

Come to think of it, now I want an X/Stargate crossover where they realize just how pointless it would be to end the world since humanity exists throughout the whole damn universe and are not anywhere near as ultimately damaging as some of the other races. Or a fic where several years after humanity is 'wiped out' an Ancient device automatically repopulates the world, or people start coming back through the stargate (with the presumption that the apocolypse wasn't instantanious and that enough people knew the world was ending to evacuate). There: that's my new X/TB apoco-fic canon.