I was listening to the Critical Drinker's after hours stream and they were talking about Winds of Winter due to the fact that GRRM recently released something Westeros related that wasn't WOW along with his many projects with HBO. They all pretty much agreed that it is highly doubtful it will ever be released, at least while he is alive.
Someone in the comments put out the whole "he owes you nothing" argument and that fans are entitled, but he did say GRRM made a mistake in constantly promising that he would end the series.
What do y'all think? I understand that he owes me nothing and I read the books between season 5 and 6 so I haven't been waiting since the 90s, but I would respect him more if he just said that he didn't want to finish and hire someone to finish. I will say now that whenever someone recommends a book series to me the first thing I ask is if the series is completed or not. I also remember someone saying that now people will be less willing to give a new author a chance if he has a multi book series.
I personally believe that once he dies (assuming he never releases the books) that his publisher will take what he had written and publish that or find someone to make it a coherent story. GOT could've been an epic show from start to finish had he finished the source material and even if he does release the last two the interest will be far less than what it could've been.
I think there's an implicit agreement with the audience when the author puts the first volume of a multi-part series. Basically, "Hey, here's part 1. If there's enough interest, you'll get the rest." I don't think anyone can say the ASOIAF hasn't been successful enough. I suspect his publisher is begging him to finish.
However, I also think that Martin has written himself into a corner. We're basically left in a situation where everyone needs to band together. However, we've established everyone is a backstabbing snake who will absolutely work against the long-term goal if it benefits them in the short run.
So yes, I think you're right. The plan is probably to delay the rest of his life and let someone else try to square that circle.
What's keeping him from just novelizing the TV show? It's not a satisfactory ending, but it takes very little effort and with a few small edits it won't be complete shit.