I don’t think so.
It’s not just because, as an author, he has reached a level success many do not. This is about his work — writings that has made his career and defined him as an author.
Writing, like anything else, doesn’t always go according to plan. Sometimes it goes fast, sometimes it does not. Martin wrote, “Sometimes the writing goes well and sometimes it doesn’t…as spring turned to summer, I was having more bad days than good ones.” A writer who cares about his or her work, doesn’t want to get it done just to get it done.
There are times where the process does go fast and certain books get out quickly. Other times, not so much. The expectation to have a constant flow of books from authors is partly influenced by the apparent relentless parade of television and films. However, even those in the film business can be pressured to rush their work. Peter Jackson said he wasn’t happy with not having as much prep time with The Hobbit as he did with the LOTR. Extending the series to three from two films ultimately gave more time to create another epic trilogy. I get that publishing and filmmaking are businesses, but when you have something that has succeeded, why risk messing with what made it a success?
Like Martin wrote, “It will be done when it’s done. And it will be as good as I can possibly make it.”