You can't make an Alien movie without the Aliens. It's simple as that. If Ridley Scott is smart, by whidch he is no dummy, then I would believe that he would scrap this idea and somehow think of a way of making new ideas and explorations while remaining true to the Alien series. If he wants to do something like this, then he might as well make a TV series about it, like Terminator: The Sarah Connor Chronicles. I recall sometime in early 2000, that Fox was debating on an AvP/Aliens/Predator TV series known as ALIENS: OMEGA, but it was never produced. This would be a good time to do it. But a movie without the Aliens? Uh-uh.. Ridley Scott, if you're smart, you won't go with that idea.