I'd say it's more likely than not. He writes at a snails pace but eats and gets fatter like he's trying to win the Indy 500. I was so put off by the long delays that I never even read Dance with Dragons. I know it's "planned for seven volumes", He's 67 years old now, unable to complete volume/book 6. Means that'll likely come out when he's 68 or 69. With how fat he is, his heart will give out or his beetus will take him out.