RFID in Libraries - Who Does Tagging?

As they did with barcoding, Wal-mark is now mandating their suppliers mark their products with RFID tags: Wal-Mart to Expand RFID in 2005. Why do we not do the same with libraries; why do we not require the publishers to include tags on books? Possibly the "big box" booksellers will require this, and we will be able to use this to our benefit. But in our industry, law librarianship, we often purchase directly from the publisher. When, then, will this just be an industry standard? Is it in our own interest to force the issue, or should we wait it out? And then the question of older books: will it be worthwhile going back and tagging books we already own?