What do you think is the fate of House Martell in the books? Are they consumed and utterly destroyed by vengeance, “fire and blood”?

I think they’re going to be in for a bad time – Doran’s plan is going to crumble, Arianne’s marriage to Aegon gets them short-term revenge but the Dornishmen who followed her are going to die, but I think House Martell will still be around to pick up the pieces.