Is Kidlit being written for adults instead of kids?

Adults are reading middle-grade and young adult novels, maybe even more so than the target audience. It may be the trend started with the Harry Potter books, but it makes me wonder.

D you think publishers are selecting kidlit manuscripts based on what adults will like to read? What might the effect be on the kinds of books published for tweens and young adults? Can adults ever really be the best judge of what kids want to read?