In my opinion if any of the main family Emma, Snow, Charming, and Henry are a possibility for dying then certainly Belle, whole while she is a major princesses is so far a very minor character in the show, and Rumpel who is a main character are both possibilities as well. I still think they are talking about Regina though at this point. If everyone believes though then it does cause the problem of what do they do with Regina. Especially if everyone believes, Regina knows, and everyone is still stuck in Storybrooke.
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