User blog comment:Lemursrule/New Bleach arc will be last/@comment-2131652-20120204015954/@comment-1351982-20120204020939

Because there are a lot of loose ends that Kubo needs to tie up and give Bleach a proper finale. Really when you think about it, it is just like writing a book like Harry Potter, but instead of taking three years to write the book at once and release it, Kubo just does it in small chunks.