This series is far from dead. If there isn't any interest, it's because the only AvP movies made were half-retarded.. even the most die-hard fan gets discouraged. All it would take is 1 solid, serious effort, with new ideas, great actors, and, for the love of god, a trip down memory lane to those magical emotions that we used to enjoy, like HORROR for example.
These movies were awesome, Alien, Aliens, Predator, etc... Phenomenal, made by some very talented individuals. They went from A to B to C, they can always go back. If they keep making them, they're bound to improve!
Imagine if they had gone with the first Predator costume for the movie of the same name. We'd all be on here talking about a giant styrofoam B-Movie ant monster that hunted humans for sport.