F.E.A.R 2 art lead Dave Matthews (not from the band) has revealed his theory that former publishers Sierra and Vivendi helped to kill off some of the fans. He states that the IP had been mishandled with ports and expansions that nobody cared about. I heard publishers did that, actually.

Monolith, the original developer, is refusing to acknowledge the games created without their input as canon. Matthews states that Extraction Point and Perseus Mandate are now set in an alternate universe. "F.E.A.R. 2 is about Alma, and we wanted to continue the story the way we originally intended," he charmingly retcons.

PS3 fans need not worry that Project Origin will be as badly butchered as the PS3 version of the original F.E.A.R, with Monolith working on all console versions simultaneously. 

Vivendi is the reason the Metal Arms series was allowed to die. They refused to make a sequel, but also refused to sell the rights to the game's original creator. Vivendi must have made a habit of screwing over original game developers before Activision acquired and then destroyed it. Karma's a bitch, I guess.