I have been filling the gap by reading The Kingkiller Chronicle and am about to finish The Way of Kings (The Stormlight Archive).
I can't believe it is taking George R.R. Martin so long in getting out The Winds of Winter
Especially considering that Brandon Sanderson knocked out two 1000+ page great epic books AND fit in the last two books of The Wheel of Time series while GRRM only produced the mediocre A Dance with Dragons.
All the while the abridged story for the TV show is rapidly going to overtake the books.
Maybe he might do a Robert Jordan on us and Brandon Sanderson can take over...
Disclaimer - The following remark was meant in jest and in very poor taste.