Let's face it, Fox did a terrible job with the latest entries of the X-Men, Alien and Predator. Disney wants thriving franchises, not critical flops and divisive movies with diminishing returns.
The Scott's Alien prequel series should be aborted and forgotten just like the Star Wars prequels were. Alien reboot movie and/or TV series please
Just my humble opinion, of course.
I really hope Disney picks up Blomkamp's project; Weaver nostalgia could renew interest in the franchise and then pick up from there with new stories (like Cameron's trying to do with the Terminator Whatever new film).