If anything, making them subforums might slow them down even more. I can tell you that, as a "main page" browser, I always wind up paying subforums less attention than top-level forums, even ones in which I'm interested, like History.Stark wrote:How does making them subforums change anything? They're still full forums with little activity, they're just nested under another forum.
I maintain that if the 3 ST and SW forums were merged into 'Star Trek and Star Wars', activity would be fine and low enough to eventually merge it into 'Science Fiction' if ti seemed necessary. Shuffling forums around is an inferior solution.
Not that I see the point of preserving PST or PSW as independent forums at all. So what if there's a new live-action Star Wars on the way? OSF will have a surge of Star Wars activity, and then it'll cool off in favor of something else, just like it does now with Stargate, 40k, and like it did every time there was a major nBSG plot twist. Unless there's a reasonable chance that putting Star Wars in a combined SF forum would push active topics off the first page (I won't even bother suggesting Trek could do it), I see no reason not to combine the forums entirely.