You never know....
With Disney's new working relationship with James Cameron courtesy of 20th Century Fox and Avatar, I wouldn't be surprised if sometime down the road an Colonial Marines-themed attraction pops up at DHS. Minus the more gruesome parts of the franchise of course.
Case in point - Aliens: Ride at the Speed of Fright motion theater show. (co-produced by Iwerks Entertainment, no less!)
No chest-bursting, but plenty of Alien-themed adventure with a squad of ultimate bad@$$eS just itching for a bug hunt.
And Predator probably wouldn't be too harsh for the parks either. Once again, we don't need to see blood and guts, but the fact that the GMR featured a gangster who was vaporized into a skeleton right before your eyes, and the Indiana Jones Epic Stunt Spectacular features a Nazi getting bloodlessly shredded by an airplane propeller tells me that having an Alien vs. Predator vs. USCM ride where you are new recruits to the USCM and are armed with pulse rifles and smart guns wouldn't be too terrible.