It's not THAT hard IF he goes all-out bastard heel. Denounce the fans and go after a major face, like Taker or Cena. Start coming out in a suit and remove the mask, saying that it means nothing to him because it represents everything the fans are that he hates.
It's been seen with someone like Michaels that if you're that over, it's going to be hard, but Michaels never denounced the fans and never became something the fans didn't want. You can have Mysterio tease his major spots and not deliver. Like tease the 619 but stop in the middle of it and low blow the guy blatantly. If it weren't PG, I'd have him flip off the crowd there, too.
It would feel forced but I think it could work. I don't think you could turn Mysterio heel in WWE's atmosphere without it feeling forced.
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