I ran across this interesting article this morning which claims that publishing was profitable in 2014 mostly on the back of the YA/Children's books, which were up 22.4 percent over 2013. It also says that ebooks sales where up 5.6 percent.
http://flavorwire.com/494377/are-you...e079-407405489
I'm not sure about the reliability of this particular website, or the linked stories in this article, but interesting none the less. I find the explanation at least plausible. I know that I still read a fair percentage of books in the YA/Children's category (some of the top sellers in that category are quite good)