Originally Posted by DiapDealer

At best, I see the development of a delayed (pre-approved) secondary ebook market. Meaning ebook retailers will "buy back" (and revoke) the license to the "new" content and then re-license them to buyers who were willing to wait a pre-determined amount of time for new ebooks to become "used" (said period of time to be determined in conjunction with the original publisher).
I don't see a will-nilly, end-user to end-user used ebook market ever happening (legally).