Dude was ever a screenwriter, not an author....and not a real good screenwriter at that.It's far worse than procrastination. I used to excuse him as an artist, because I get how frustrating the process can get. Even when he was making other properties like Wild Cards, I defended him. Then he started doing everything he could to make millions upon millions off of Game of Thrones by doing anything but finishing SoIaF. Nah, not cool. Not cool at all. That's downright greed and disingenuous.
Once he got a chance to be at the Pinnacle of his chosen profession it's just common sense that would take precedence in his life ... finally gets the respect and admiration of his peers....and better yet,...their envy