Not too sound like a grovelling fan boy (even though I kinda am...) but he's literally writing the fantasy epic of our generation. That's so close to being an objective fact at this point that it almost can't be argued. I think people have vastly underestimated the level of effort and work he's had to put into this project, and just how complex and interweaving the narrative material he's invented is. You can't put a timeframe on that. Speculating that he just 'doesn't care' any more or that he's too busy on junkets to write anymore is not only hugely disrespectful, but completely unfounded when you actually stop and really think about not only the complexity of the story at this point, how much it means to him as a whole and also the context of his life in general right now. The mans gotta live, not just write us stories.