I'm surprised that the whole 'brony' phenomenon has lasted as long as it has, to be honest. I'm not surprised that people still watch the show, but that people still have pony pictures as their avatars and discuss it on such a regular basis all over the web. They're still everywhere you go, which just strikes me as bizarre.
I think if the reputation of the fanbase has declined at all as of late, it's because to those who were only in it for the initial novelty or sense of irony, it's worn off by this point and only the die hard MLP fans are still hanging around.
Personally, I'd be happy if the whole craze died tomorrow, but that's been my opinion since the very beginning and seeing as that's not likely, I've come to peace with the whole crazy ordeal.