Though bare this in mind and forgive me if this sounds cynical, Alien 3 has divided the fanbase, fans of James Cameron's Aliens hated the dark nihilistic installment that ended Ripley's story. But despite its flaws it has a fan base. Neill is now making his movie which is to follow after Aliens. Maybe it will bring back integrity to the Alien saga from fans and critics "not counting Prometheus owing it note being a sole centered Alien film, while it was critically well received fans were divided about it."
However it is possible that Neill's movie could be awful, possibly even more damaging than Alien 3. Much like with Superman Returns it was meant to following Superman 1 & 2 while ignoring 3 & 4, though it promised to be a comeback that movie wasn't all that better. The same goes for Halloween H20 retconing Halloween 4,5,6. And Highlander 3 retconing Highlander 2. Despite how they may be preferred they don't necessarily serve much purpose outside of trying repair irrevocable damage to the franchises reputation.
Neill's off to a great star with District 9, Elysium and Chappie were less than well regarded. Like M. Night Shyamalan he seamed to be on going down hill. Will Alien be Neill's equivalent of M. Night's Last Airbender? I hope to be proven wrong.