Interesting article. I think it will hold particularly true for what would have been mid-list authors. Whereas someone like George Martin can spread out the time between books and be guaranteed an audience, I think the majority of authors, those who make a decent living at it, perhaps, but won't be household names, will have to increase output or risk being pushed aside by authors who have.
http://www.nytimes.com/2012/05/13/b...-writers-cramp-a-book-a-year-is-slacking.html
http://www.nytimes.com/2012/05/13/b...-writers-cramp-a-book-a-year-is-slacking.html