I mean... Talking about blame is a bit silly for me in this context. It's his work, his ideas, and his reputation in the end. I dislike the fan entitlement, raging and pressuring the author. On the other hand, if a lot of time passes, people will lose interest... Me personally, I love ASoIaF, but I don't really care anymore. If it gets finished, it gets finished, if not, well, not like there's no other amazing books.

That being said, he was notoriously slow with the books (or was overly optimistic when announcing the next ones) way before the show was even announced. Also, it was his descision that the show gets done. He had to have known that they're going to overrun him, as these things are made faster than the books are written.

So, while I'll never rage at him or rant about the delay of the books, I don't really have much sympathy for his writers block, or whatever it is. It's a bed he's made himself, and it's pretty thickly padded with money, so I don't think it's too hard being George nowadays. :)