I am A-OK with Neill Blomkamp's flick being a follow-up to Aliens that ignores Alien 3 and Alien: Resurrection. I've been ignoring those movies for years.
Plus, didn't Prometheus already do this? Making Peter Weyland the founder of the Weyland Corporation who lives late into the 21st century directly contradicted Alien vs. Predator, which itself retconned Alien 3 by having Lance Henrickson's Weyland character die in 2004.
Prometheus (and its eventual sequel), the original Alien, Aliens, and now Blomkamp's Alien. I think that sounds like a much better chronology than one involving A3, A:R, or the AVP films.