I'm not concerned with Pathfinder specifically, but this is the forum I read most for other d20 stuff like True20, D20 Modern and others. Having this forum separate from the others is very convenient for me.
From a completely selfish standpoint, I'd like to see it merged with General, because I'd love it if I could get more people talking about Star Wars here. ENWorld has a ton of awesome people on it, and I'd love to be able to talk with those people about Star Wars. As is, despite its popularity, Star Wars is barely mentioned in the forum's blurb, so I think it tends to get overlooked.
I voted 'other'. ISTM, if things in general are whipping of the screen too fast, then it should be broken up, but somewhat more evenly than the current arrangement. In a way, it depends what you plan to do WRT 4e and 3e cometh the hour.
I wonder if it's the lack of a dedicated forum that leads to the lower Pathfinder traffic, or if it's the lack of interest on the EnWorld boards.
Paizo has its own boards, and they don't seem bad for this purpose. And especially during the Alpha & Beta phase it makes sense to post heavily on the Paizo boards, since it's a public playtest and that's where they will look for input and critic. Anything on EnWorld might get missed...