Don't joke about that.
But seriously, Edge would be fine as a heel. He was a heel before, and 'screaming little girls' weren't a problem. Sure, he's a pretty boy, but not to the extent that someone like Jeff Hardy was where it would be hard for people (alright, teenage girls) to cheer against him.
Really though, turning him heel right when he returns is STUPID. He's gonna get huge return pops. Milk that for awhile, and then turn him heel maybe. But to turn him heel right when he comes back? STUPID.
Well, obviously you gotta wait to turn him heel, unless you build him up as a heel before he returns, which is already too late to do.
And Edge's E&C character was strictly "midcard heel," just like his face-turn post-KotR win was "midcard face." He's too goofy to main event in that character. Rock does a lot of comedy, but still has an aura of legitimacy around him no matter what, and can cut a serious promo when he needs to.
Edge turning heel, calling faces "dorks," and acting like a goofball isn't going to be a ticket-selling main event character.
Yeah, I'm sure at least 10 percent will spring for 50 bucks to see him for a few minutes in a segment where there is no nudity, while Stern himself makes fun of WWE on his show.