If this is the last its because of diminished returns and public interest. 1998 ($83,892,374)--->2008 ($20,504,740). Those numbers are just from yahoo right now. Would the studio risk another at that rate? A lot of people I talked to were fans of the series before, but then I heard them say they don't care anymore after seeing the previews. 3rd rate actors like Xhibit and Amanda Peet? What? In the trailer you could not tell what the story was about also! One friend just never got around to seeing it and this is a person who owned the original x-files video game on PSone, which I don't even have, so you can see the problem! Its not bad timing, the public doesn't care care for the trailer and what it promised. It looked depressing compared to fight the future, especially with no aliens or monster to fight.
Compared to other movies this decade, the quality of the story and dialogue was a little below. If you compare it to the writing on good episodes of x-files, or other science fiction of the past it emulates, then it kind of sucked. If you were expecting aliens or a final resolution to the story, then you are hating yourself for waiting this many years, and hating the creators for that implied promise.... But, my point is that they managed to drive a stake down the middle of the remaining fans. There were the semi-hardcore people that loved the paranormal, monster, & alien stories, and then there were the mentally unstable M&S obsessives...you can guess which group was satisfied. I know for a fact that the monster & alien fans are still around because the scifi channel is still going strong....you just have to give them a real reason to see the movie, and there wasn't one at all unfortunately.
Is this the end of the X-files?? I don't know. I just hope they rip it away from the creators next time, because I think they are so lazy!! Give the story to someone that can write a real ending to the series!! M&S are so dead right now. Their relationship was like watching decaying mummies fall onto eachother on the floor.