Say it ain't so!In a chat with Deadline, the producers of HBO's acclaimed series GAME OF THRONES has only 13-15 episodes left in it. This, despite Sunday's season finale being the highest-rated in the show's history. For some time, the understanding has been that GAME OF THRONES wouldn't make it past an eighth season, but with the rollicking success of season six, you'd think there would be some chatter about extending the show's lucrative run.Sadly, the producers sound like they're going to stick to their guns.