Ahhh ... I wondered when the ol' Gaiman defense would be trotted out.
Martin brings on the criticism himself, by being so public about his appearances and hobbies, and side-projects (and passion for the Jets, and figurine painting... yada, yada).
Fans (most fans anyway) would be happy to wait for his books if he wasn't in everyone's face with all the
look-at-me-not-working-on-the-stuff-you-really-care-about-(and that made me what I am today) aspects of his life.
Martin doesn't care about finishing this series. That's why he's letting HBO do it for him. He just needs to admit it and move on.