Ahh "Game of Thrones" my addiction. Yes Cersei might betray Jamie and marry Euron Greyjoy as she can do anything for the throne but as per my guess it is very unlikely that Jamie will kill his own sister Cersei or vice-versa. They just had love in previous episode. I also have made a post on the piracy issue that is going on with GoT. Bdw whom do you guess to take the Throne finally ?
This is an excellent question!
My guess is nobody, I think that the plot is setting up to have the full 6 episodes of season 8 as a battle between the living and the dead.
It's because HBO has announced 4 preludes of Game of Thrones about the backstory of Rhaegar, of Euron, of Robert and Ned ... etc. All the preludes run in the same year.
And then after the preludes finish it'll be a time jump to what happened after the war with the white walkers.
Very ambitious plans actually.