I think that Rumples killed them with the Dagger but who kill the DO with the Dagger is the next DO. If it was so easy to get rid of the curse Zoso would have killed himslef, but he couldn’t so Rumple is alive. I think the paradox and the act of love he did for sacrafiing him and give his dad a TL Kiss is what let him survive, but kill the DO curse. I think he is in the scroll. The next who cast the curse save Rumple, who is captured like in the Pandora Box.
I think with this sacrfice he also make clear which way you can break the next curse, with a loving father and a son. So my guess is on robi and Roland. They will get their memories back fast, but who is the villian and why did the curse was cast is now the Question.
LONG LIVE OUR BELOVED RUMPLESTILTSKIN
(Villians like you deserve their Happy Endings)
maybe this is why they keep saying the word “hope” I bet Rumpel is their only hope at some point when everything seems bleak and wwow is winning, Rumpel shows up with Belle or something