It would be some decent story telling even, a twist of the interesting kind. Magic comes with a price, as we know. And it would be some irony, if counteracting the evil Pan created or made use of, and counteracting the Dark curse Pan adapted to his wishes, a curse Regina made use of, put together by Rumple, would contribute to unleashing a new formidable evil, attacking especially Regina (and maybe Rumple as well). Good creating evil creating good creating evil.
wow I’m speechless. you should be writing for the show