Tom Hendricks wrote:
Hell, they may end it after 7 seasons and do a wrap up movie. No where does it say that HBO has to produce the entirety of Games of Thrones.
HBO would say that. It's their highest-rated program, and it would look bad for them to shunt the climax off into theaters, as it would irritate their subscribers.
As far as the book/season thing goes, possibly Bran and Davos will need material from Book 6 in Season 5, but everybody else should probably be okay. Season 6 will be Book 6 material for almost everybody from the get-go, and the few that still have some Books 4/5 left over will get there.