I think its reasonable that if you start a series you are expected to work on it and finish it within the living memory of your fans!
Perhaps. But, shouldn't he be more concerned with making the work GOOD. After all, if the quality declines wouldn't that be the memory of the fans...?
But, ultimately, HE'S the one doing the work, he gets to do it on his schedule.
No, I don't think anyone would expect someone to become a writing hermit. But I'm not a hermit and I work 7.5 hours a day 5 days a week. I think a solid work ethic would mean you would dedicate yourself to your task. And 20 years to write 4-5 books is a touch long.
I'm a writer. A playwright. Sometimes the quality doesn't come on demand. I could churn out pages...pages and pages...crap is easy to write.
The real art is in the craft and shaping. And it takes time. And sometimes it takes stepping away and recharging.
It's not like my day job where it has simple x, y, z things to accomplish that don't really require and artist eye.
And yes, its just a book. But could say that entertainment keeps our civilization running!
Sure. And there's lots of entertainment out there.
And maybe Martin wants to take a moment or two to get entertained...it keeps an artist going too...