That's why he stepped away from the show last year. Then he said the book should be out 2017, and then this was his latest update last month:
And, yes, I know you all want to know about THE WINDS OF WINTER too. I've seen some truly weird reports about WOW on the internet of late, by 'journalists' who make their stories up out of whole cloth. I don't know which story is more absurd, the one that says the book is finished and I've been sitting on it for some nefarious reason, or the one that says I have no pages. Both 'reports' are equally false and equally moronic. I am still working on it, I am still months away (how many? good question), I still have good days and bad days, and that's all I care to say. Whether WINDS or the first volume of FIRE AND BLOOD will be the first to hit the bookstores is hard to say at this juncture, but I do think you will have a Westeros book from me in 2018... and who knows, maybe two. A boy can dream...
"Finish the damn books, George," is a favorite saying of mine.I think it's more than just a time management problem. Every author is different and he was never one to just plug away at the story. I don't think he handles pressure well and the anticipation added by all the new fans plus the comparisons to the tv show when it does come out. I wouldn't be surprised if he was blocked. Fire and Blood is probably much easier for him to write at the moment. I also noticed he said none of the series HBO is developing are based on works of his that he is still writing. He says he wants to finish the stories himself before they are adapted.
It took him years to figure out how to get various characters in Meereen. I think one of his problems is that the series was strictly meant to be a trilogy, with a 5 year jump. Then he eliminated the time jump and has found himself adding more and more to the story. Books 1-3 only had the following POVs:
Starks- Ned, Catelyn, Sansa, Arya, Bran, and Jon
Lannisters- Tyrion & Jaime
Greyjoys- Theon (but only in book 2)
Seaworth- Davos
Targaryen- Daenerys
Tarly- Sam
By the end of Book 5, almost every single character had a POV. 3 more Greyjoys (plus Theon again in Book 5), 2 Martells (and 2 Martell allies), Barristan Selmy, Melisandre, Brienne, Cersei (and Kevyn had an epilogue), and a character named Jon Connington, who was with Tyrion for a bit but is now with the (imposter?) Aegon VI.
I really think George lost his way. I have no idea how he'll complete this story in two books (unless they're both like A Storm of Swords, which is still my favorite of the bunch). He has set up two major battles, one in Essos, one in the North. And that doesn't even cover whatever he plans to do with Sansa, Jaime, Myrcella (maimed but very much alive) and Brienne.