I think the belief is a good idea, but i agree it should be the collective belief, not just Emma’s.
Put me in the same group who feel the idea that belief holds the realms together is perfect. But it should have been everyone and not just Emma’s belief.
It would have been a nice tie in to last season finale when Henry needed everyone to believe in wishes to bring his family from the Land of Untold Stories
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"He was a lot of things to me" "The only conclusion was love"