Won't lose books
If you have all of your purchased Kindle books on your Kindle (and any other devices you use to read them), you will not lose them if Amazon goes under and disappears. The books on my Kindle are in the flash memory of the Kindle - they do not depend on Amazon to continue to be there. And no, they don't go away if the device doesn't ping Amazon every now and then. My Kindle normally has its WiFi turned off to preserve battery - it has gone for months with no contact.
So, quit giving out false information on products/systems you don't happen to like.