I figure "half-and-half" might be the best way to explain things.
Half of the new posters frequent Pony General, and half of those post elsewhere in the forums.
Half of the new users are pretty cool, half of which focus on being lulzy and that other half can be more serious.
Half of the new users are the bane of my existence.
A few users have left, most of which said the forum had gotten boring.
Half of the threads are uninspired crap, in my opinion, but a small percentage of them become golden. Half of the threads are OK, some of which stay active where users get some good value out of them.
Nothing special, I guess.