Tom Hendricks wrote:
The one thing you have to keep in mind is this, how long will HBO actually allow GoT to continue. Because as episodes go by, it just becomes more and more expensive to produce. 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.
It's one of their most popular shows, why would they want to give it up? If it was less successful, they could be thinking about axing it, but as it is, they'll want to milk that cow for what it's worth. There was some talk a while ago about them talking with GRRM about buying the rights to adapt Dunk and Egg. (They would presumably do it after GoT is finished, and it would also cost less, so why not?)