I’ve been thinking that if Robin “dies” in episode 21 “Last Rites” it may very well be linked to what happened in “The Price” and going back to that, well, Robin jumped straight into a sword protecting Regina. So if that has something to do with Robin’s demise, Regina will be thoroughly heartbroken. Perhaps, Hades will claim Robin’s life to have the price paid. Regina will want to give up her life to save Robin once again, but of course, Robin won’t let her. If we toy with the idea that Robin may not be completely dead, perhaps his fate will be linked to Regina. A&E just said that the road to redemption is long and that forgiveness really has to be earned, so maybe Regina now has to spend all her time on that little project to have Robin one day (maybe not for a while) rise from an otherwise eternal sleep – or at least something like that.
I say this, because it really does not make sense to kill off Robin for good (MatthewPaul already wrote why).