My opinion will be unpopular, but I think RRMartin is just milking it at this point. I've listened to all the books published so far as audiobooks, and my experience was that the first two books were very fun, and then it started to drag out -- more and more characters introduced, the same sort of imagery and conversation patterns repeated, and time just stopped moving altogether. By the last book, I was just bored silly and it was all I could do to trudge through it.
RRMartin got famous, got money, and has been milking it, extending it, trying to make sure it never ever ends. I'm interested enough in how the story turns out, should it be finished, that I will read the wikipedia synopsis of it. But I would never deal with the whole repetitive unabridged bullshit ever again.
NOTE: I've only seen the first season of the TV show, and I liked it a lot. The TV show is quite likely way better than the books because there are some natural constraints in that context. I won't pay for the shows though. I don't want to give RRM anything -- he took a promising interesting story, and is just torturing it now for the money. Fucker.