My personal feeling is that Moore, despite the shit he will often spout, wrote a way for there to be a sequel, and I think that it hinges on the journal.
i always thought of it as a "the book isn't closed" type thing. like, leaving the story without finality. i know that's very similar to saying left open for a sequel, but i think its moreso just not ending the story with the final page of the book. like the end of terminator two. ....which.... lead two at least two sequels and a tv show.
