Board Thread:Spoilers!/@comment-26159109-20170115054549/@comment-26967699-20170115190955

The only person who would leave because of Emma is Hook, as he became regular due to Emma and CS. So if Emma leaves, so does Hook. As a matter of oourse, the CaptainSwan love story would end (this would be probably the only good thing). But here's the thing: The show can live without Hook (like S1), but it can't live without Emma, Regina or Gold. The general plots are always circled around them: Emma finding herself in the world, Regina getting her happy ending and Gold finding his son (although the latter has been concluded.). So, if Emma leaves, the show probably would try to continue but ultimately end. Both because of the main character leaving and because of the ratings dropping. (Most people watch it because of CS).