First off, I'll disclaim an intent--much less qualification--for writing it, but I still think that a book on the art of the hand-off would be a useful thing. Because handing off a project, a job, a company or what-have-you is too often a reactive process, even when it's planned. That's just how organizational inertia works.
Although, on second thought, perhaps the work should be split into two books, one for the hander and one for the handee. Of course, keeping them both on the same (figurative) page is another matter.