I’d rather see Rumple conquer his darkness than be cured of it.
So would I actually, I’m just throwing out theories. I want him to stay the Dark One for a very long time but to turn it towards good like he said he would back in “A Desperate Soul”
I’m not sure that that would even be possible. The Dark One curse seems like a parasite, that latches on and sucks the good out of your soul, the way a leech would suck blood out of you. Only way to fix a leech bite is to get rid of the leech. Only way to overcome the Dark One’s influence is to have it expelled from your body.
Losing his curse doesn’t automatically make him all pure and innocent again, and doesn’t absolve him of all his problems. It turns him back into a man who needs to find his own inner strength to be good and make up for his mistakes.