Brienne will definitely be involved in the final battles of Game of Thrones, but her survival odds seem about even right now. On the one hand, she's sure to be in the thick of the fighting, and her death would be an emotional trigger for several other characters including Jaime, Sansa, and Arya. But on the other hand, she might be just unimportant enough for the writers to let her survive to help pick up the pieces.