The last time I created this particular thread, it amounted to nothing more than a joke, but I am serious when I say this:
The only way I'd enjoy an alternate sequel's with James Cameron as the primary Producer and David Fincher as the Director, because that's the only way it's going to feel genuine, not just a random fanboy rewriting part of the story.
James Cameron obviously feels a measure of regret in the way the narrative got dealt with, but in of itself that's not a strong enough reason, perhaps within the world of Alien it is.
But from a real world perspective, the only way I think it's going to feel right's if David Fincher gets to turn his old negative experience with Alien into a new positive experience if you grasp my meaning, he gets to make the film he always wanted to in the first place, any other type of alternate sequel, just honestly not worth a damn.