Regarding the South Park question:
Frankly, the Brony phenomenon hasn't gained enough mainstream attention to warrant a South Park episode on it, and frankly I hope it stays that way. It's nice to fly under the radar; we don't suffer from fan dumb or haters IRL, and as long as we stay on the internet, it'll be love and tolerance from here on in. Can you even imagine what would happen if the fandom got any real mainstream attention?
"Coming up on Dateline_: they call themselves Bronies: twenty year old men who are obsessed with My Little Pony. It seems harmess, *but could they actually be pedophiles in disguise?!?!"_*
Granted, some of the /b/tard bronies probably are pedophiles, but I digress.
If Parker and Stone actually did a Brony episode, it'd be hard to say what they'd do with it; it'd probably depend on their opinion of the show, to be honest. Their point would probably be one of the following:
1. Bronies need to man up and stop watching kids shows, or
2. Bronies are perfectly fine in their interests and everyone else needs to man up, because it's just a fucking cartoon. I hope this'll be what they go with, it seems to be the more mature option.
A few things I'd like:
-Cartman has to think it's gay, because he's Cartman.
-At the end, the wrapper-upper (as in when Stan or Kyle "learn something" at the end of the show) will be a spoof on Twilight's letters.
-Something about Cupcakes. That would be hilarious.