Wow! so many great comments and insights on this thread..kudos to everyone! A few thoughts sparked in me from reading this thread today:
Rumple said the dark curse was THE curse to end ALL curses…maybe the curse is supposed to end all magic. He said the true love potion would be the ultimate magic and that you could do anything…including getting magic to destroy itself?
That favor Mr. Gold wants from Emma, maybe this would be the final act to take magic away from their lives forever. And to end his own curse.
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