A consensus was reached to delete the book namespace from the English Wikipedia following an onwiki discussion. In preparation for this all books have been moved to other namespaces to ensure page history can be accessed after deletion. The only page left is a redirect from the proper title of an article without significant history. It should not be moved and it's fine that history becomes inaccessible.
I also believe $wgCommunityCollectionNamespace should be changed because of this.