There was a small announcement today from print-on-demand service IngramSpark that offers a great new opportunity for self-published children's book authors. It's not currently offered by CreateSpace or Amazon direct, but hopefully they will match what IngramSpark is doing. This article offers a detailed breakdown of that announcement and shows how it can impact the way you think about your book’s design.
When it comes to putting heat on Amazon, I recall the prophecies of doom when Apple came out with the iPad, when Google introduced Google Books, even when Barnes & Noble began selling the Nook -- oh, woe is Jeff Bezos!
Didn't work out that way.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook.)