Board Thread:Spoilers!/@comment-27060727-20151022205759/@comment-25375217-20151023221824

I'd like to point out that Swan Song usually means before death. So Emma dying and meeting Hades is not unlikely. She could kill herself with the dagger, like Rumple, which would get rid of the Darkness as long as no one revived her in the way Rumple was revived. If she had to escape from hell...

But even if it doesn't mean her death, she probably will not be the Dark One anymore going into 5b.