It's probably a mistake to think kids need new books to be published. The classics are classic for a reason. There are many childhoods worth of incredible books already available. I'm not weeping for struggling authors. If they write something incredible it will be noticed, if they don't then just like you said Bridge to Terabithia, Nancy Drew, Redwall, HP, The Hardy Boys, Chronicles of Narnia, Eragon, etc, etc, etc. still exist.