This hadn't really occurred to me until I talked to some other publishers. As we know from D&D Brand Manager Scott Rouse's posting, d20 will vanish in less than a year. That means that all of the d20 PDF material for 3.5 that's out there now will have to be remade as new PDFs with the d20 trademark removed. I certainly haven't surveyed the entire industry, but the few publishers I know plan to delete those products rather than redoing them without the logo. If others follow suit, considerable d20 3.5 material could vanish from the market in very short order.