Board Thread:Spoilers!/@comment-6175354-20150703211827/@comment-26443838-20150703221031

Regina and Killian might do some sacrifices for Emma. After all Adam and Edward said that Killian may do a major role to save her. They both probably might die. Zelena might control Emma to do it and might succeed. But even so, if they both sacrifice themselves, it doesn't mean they are gone from the show. They can still appear in flashbacks and possible time travel events, just like we saw Neal and Graham.