It will be logical though because Zelena will do something to Emma's family, her baby sister or brother. So I think, the story will make a logical turn for Emma to defeat the wicked witch and break the curse, she is after all the main character/protagonist IMHO.

Besides, Regina doesn't even have her own heart. She may get it at some point and Rumple will get his dagger but they will end up helping Emma defeat the witch.



Is it not water that always kills the Wicked Witch of the West? They might just throw her over board on the Jolly Roger.