Drakain, I know you are joking, but I wouldn't be surprised if Cersei dies by the half way point. It is a safe bet the final season will probably be White Walker centric/final war/wrap up, which means they need to wrap up the Kings Landing/Iron Throne stuff sooner rather than later. I wouldn't be shocked if Cersei is defeated by episode 3 or 4, then they wrap up the other stuff (Euron, Littlefinger), then end the season with the Wall coming down and the undead armies beginning their march on the southern lands.