I don't think a cure will be added. And it shouldn't. It would devalue the importance of the ritual. True in the original concept, Astarion was supposed to both accept this "payment" as a sun for his past before Cazador. That's why the ending is so bitter. And I have more faith in this concept. But we have no reveal and it seems like a hard right way to go, despite everything that happened. This one has an open ending as Astarion and Tav search for a path to the sun. I think to have a sense of completion - cinematic clips like Astarion reading some manuscripts would be great.
Yet I agree that Tav should be able to run after him for a hug. It was the right thing to do. Maybe Astarion will want to be alone at that moment, but you can show that too.
Like letting Tav say "I love you" to AA, kiss with a happy face and hug. Yes, evil couple, love and support each other.
