Scott had dibs since he announced his intentions to make a series taking place before Alien and tying into it before Prometheus was even released. End of story.
Perhaps Blomkamp could make a film called Aliens #2: The Twitter Interloper.
Releasing his fan art online as if it was "Oh, What Could Have Been, Hicks and Newt Fans Wink Wink" was such a poor show on his behalf. He only has himself to blame.
What does Predator have to do with the Alien films anyway?
Don't Predators, Terminators, Robocop and Batman all exist in the same world too? I wan't to see THAT shyte on the big screen.