Well, right now I'm predicting that Winds of Winter
is released 2017, and we never get the final book. I'd love more than anything to be proven wrong, but very little evidence exists to encourage me. It's embarrassing enough for him that he allowed a TV adaptation to be made, and it's going to beat him.
Ideally, we'd have had AFFC/ADWD as one book in 2005, then Winds of Winter
in 2010 or whatever, then we'd be awaiting the final book right now to arrive before the show ends. As it stands, we're getting a pretty clunky, unclean ending to the series. If the final book ever does arrive, we'll already know what happens in it.