It’s also important to remember that Emma is supposed to bring back the happy endings and her time travel shenanigans give her the moral need to make amends. Likewise Regina will need a reason to re-open her heart and leaving her bereft of true love with no reason to embrace her true self which has been on display all this past season would be very poor drama.
Let us all remember what Robin said about “things working out when they’re supposed to.” Robin is Regina’s happy ending after all.
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Custodian of Graham's darts, Rumple's spindle and Robin's quiver