I wouldn't want to walk in GRRMs shoes. Having to deal with his fans' expectations seems to be demanding. You can't really control these.
But then again he decided to remain a public figure. He knows the circus rules and still didn't turn to woodworking or writing in private or whatever instead.
I think he owes nothing. Fans of his work are allowed to be disappointed. But they shouldn't mock him for being old and depressed.