I'd rather have this than the limited activation/ permanently online crap that Ubisoft and others are trying to force onto people. At least it ostensibly rewards a buyer (even if in reality it's just giving you something that could easily have come with the game anyway) rather than dumping on him or her.
As far as used game sales go, I'd imagine publishers regard it as actually worse than piracy. Most people pirating a game probably wouldn't have bought it anyway; people buying a used game are at least willing to pay for it, but the publisher still gets nothing. That's not to say they actually should get anything- they might want a slice of future sales but they're not entitled to it by any means and there's no compelling reason to make them a special case.
In any case DD will pretty much stop the used game market, I'd be amazed if the next generation of consoles still followed a physical retail product model as extensively as this one does.







