Hmm... At first I was going to oppose having the newest episode thread in the General Anime as it would look strange and inconsistent there, but I suppose it might work, after all. In the end it wouldn't increase threads as such if the old one is moved to the En Fuego as soon as a new one is created. I don't know if it's really true more people would participate in the discussion, though. While people might fail to notice stickies and such, it's only because they weren't looking for them with interest. However, if they want to say something about an episode, I'm sure one more mouse click won't slow them down.
It would somewhat lessen the importance of En Fuego of course, seeing how people wouldn't even need to visit it anymore if they only pay attention to the latest ep, but if you think it's a good idea, go ahead.