Short books and Hugh Howey

I’ve already posted about why I think books will get shorter (though I should probably re-title that, why I think shorter books will become more popular), and I recently read Wool by Hugh Howey, which is an excellent example of a short book (12,000 words) doing really well. In the science fiction category over on amazon.com, the Wool omnibus (books 1-5) is currently in third place behind two George R. R. Martin tomes, has been picked up for hardcover release in the UK, and Ridley Scott has signed a movie deal.
Oh, and if you haven’t read Wool, I highly recommend it. The first book includes the thrill of discovering a new world and does an excellent job of playing on the readers hopes and expectations.