Honestly, I'll just be happy if Martin can finish this thing before he kicks the bucket. He's old, in bad shape, and has had health problems on and off for years, though nothing overly serious.
Five years between books sucks. I'm not sure he has ten years left, and he's notorious for over-writing anyway. What started out as a trilogy is now at least 7 books, and I have serious doubts he'll be able to finish the series in two more books. This thing could easily go to 10 books like Sword of Truth or Wheel of Time.