I still think it's a bit misguided to call this episode a parody of "The Lottery". Parody is like, "Ha ha, we took this thing and made it seem similar to The Lottery." This was more like, "Dude, what's happening right now is The Lottery. The next level of it." They actually implied that what's happening to Britney Spears is the next phase, the thing that happens after The Lottery isn't good enough anymore (the townspeople said stoning people was too brutal, so now they make them kill themselves). Of course, the stuff about the corn harvest does venture more into parody territory; maybe it would've been better if they had found a modern parallel to that, something that actually made sense.
And I really am worried about Miley Cyrus. Her fate seems inescapable.
Speaking of which, I would argue that Britney's predecessor was Anna Nicole Smith. They made a spectacle out of her misery and then when she died, they mourned her as if she were their queen. The disingenuousness of it all was truly astonishing.
According to Wikipedia they were chanting "Rectus Dominus". Not quite proper Latin, but it does more or less correlate to "Butt Master".