Steve, I really like the idea of a top-down look at productivity and I think it has the potential to reach the broadest audience of the possibilities listed.
I visit several productivity/lifehacking/GTD sites and just in the last six months I've started seeing a significant backlash against "productivity for productivity's sake". It feels like there's an information vacuum out there for people who want to streamline their everyday lives but also want to connect their everyday lives to their higher goals and values. I'm sure your unique perspective would be a great help to these folks (and me!) and that your book could stand apart in a crowded field.
Just as a side note, I've never cared for the term "time management" (outside of the final five minutes of a football game). In my experience, managing my attention and respecting my energy levels are much more important than timing myself against a clock. Of course, YMMV.