I think good old George is in denial.
http://io9.com/which-jurassic-park-character-will-definitely-be-in-jur-1546793860/all
He seems to think that since 'Storm of Swords' will take 2 seasons to cover, then the same will hold true for 'Feast' and 'Dance'. That means he believes the TV show will run for 10-15 years giving him plenty of time to finish the next two books.
George R.R. Martin said:'A Dance with Dragons' is itself a book that's as big as 'A Storm of Swords.' So there's potentially three more seasons there, between 'Feast' and 'Dance,' if they split into two the way they did [with 'Storms'].
<snip>
Now, 'Feast' and 'Dance' take place simultaneously. So you can't do 'Feast' and then 'Dance' the way I did. You can combine them and do it chronologically. And it's my hope that they'll do it that way and then, long before they catch up with me, I'll have published 'The Winds of Winter,' which'll give me another couple years.
http://io9.com/which-jurassic-park-character-will-definitely-be-in-jur-1546793860/all
He seems to think that since 'Storm of Swords' will take 2 seasons to cover, then the same will hold true for 'Feast' and 'Dance'. That means he believes the TV show will run for 10-15 years giving him plenty of time to finish the next two books.