It would suck if Corey left, considering he is the face/voice of Slipknot, but I don't think the majority of their fans would abandon ship if it ever happened. Like 'em or not (I'm definitely for the latter, though I consider my self a fan, just not a "maggot"
), Slipknot fans are fucking dedicated. If he ever left, I see it as an opportunity to get someone better. Even though Corey's voice is unique and instantly recognizable, he was never the best live, at least since the Vol. 3 touring cycle.