QuotePrediction: Power hungry Targaryen betrayal.
Her or him?
I dunno. I now tend to see Daenerys biting it a the battle against the Nightking.
After that its all John (Sansa/Jamie/Tyrion etcetc) vs the lioness. Therefore taking revenge for both the Dragon and the Wolf, coming back at Cersei in one person.
And maybe he will even show mercy to her, like Ned in the first season.
Spoiler
And she cuts his throat lol