I'm pretty confident that Fox regulary visit this forum to get an idea of what fans want in either an Alien or Predator film. I guess the only films this forum could have therefore influenced is everything from AvP onwards..
During the production of AvP, AvPR, Predators and now Prometheus the most popular topic of conversation is the athesetics of the film (eg the look of the Predator, the shape of the Alien, weapons used etc). We give the impression that us fans care more about silly little things than actually story.
I hope when the next alien or pred film is made, this forum makes a concerted effort to push for a good story over stupid things like the size of the SJ, the number of mandibles Pussyface has, the shape of the xenomorph. You can have a perfect looking alien or predator doing perfect and keeewl things but non of it would matter if its all in a shitty film.