I don’t think Robin’s potential death would have any real payoff except to send Regina spiraling back into villainy, (much the way Neal’s death served to return Rumple to his villain status after he’d striven so hard to save everyone form Peter Pan). I don’t find that kind of character regression very interesting. If the main reason to kill off Robin (assuming he dies) is just to send Regina back over the edge or to make her suffer, it sends a terrible message that characters who are essentially good parents aren’t worth keeping around.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy