Atlantis is very distracting. *g* But not that many Stargate writers are embracing Atlantis. A few, maybe.

While all the things you mention certainly have had some effect (although I'm thinking they might actually have *increased* the amount of fic being written) it's likely that the peak of fic-writing for the fandom has passed. The show's been around for a long time, and a lot of folks have moved on. And yet there's still new writers wandering in and that's all very good. *g*