Qifrey and Olruggio kids will be the one that save them from the curse.
Trick is, forbidden magic will be heavily used and I think Coco, as a symbol of Hope, will take up this role and turn forbidden magic into something that's necessary when everything else failed. Idk if I am right, but I think compared to the rest of the people in the show, Coco has talent for forbidden magic.
Anyway I am not the manga reader. But just a projection for the storyline. Like you know how Harry Potter is. Something like that.
I also have a running theory Coco somehow got her talent from her father. Guys, please comment if this is entirely impossible.
Coco's last conversation with her mother strikes me as something very significant to point out why Coco is very much fascinated with magic. Now on top of Olruggio and Qifrey's tragedy, plot twists maybe, how Coco's father is related to brimmed hat, and that's why Coco was targeted at the first place. I mean they could have chosen anyone to plant the seed, but they chose Coco for a reason. Is this something being explained later in the manga?












