Point 1: Valid, but not really what is concerning companies. I guess I speak for myself when I say that the $5 difference in price is never the selling point for used games for me. I'd rather pay the extra $5 and be sure I got an unabused copy. The same applies to trying new titles. $5 off isn't going to get me to try the new risky game. I wait at least a year for 20 - 30 off. Yeah, it's true that the used market has got me waiting with baited breath for the new releases later, but they're after the quick turnarounds, not the more general used market. Besides, if $5 is really going to break your budget, perhaps you should be in the gaming world in the first place.
Point 2: only recently valid. Those of us resistant to the whole digital thing have pointed out the possiblity off massive server outages to general dismissal. We only recently have a real life example of it being a real issue.
Point 3: not related as it's a technical issue. They could easially embed the code in the game and link the code to your account the way it does now without the manual entering. That is more a courtasy to show that yes, this code has yet to be redeemed.
Additional point: the type of gamer inclined to trade in the game in two weeks may not even redeem the pass. I've received day one DLC in used games that could still be claimed, so I imagine there's going to be a few unclaimed online passes in the used section, game depending.
I've always said the best thing for publishers to do is to try and make a deal with gamestop for used games, controling when games may be offered used and a cut of the price. It could be tiered by age, as in, 50% percent of the profit for a game less than 6 months ond, yet only 5% of the profit on soething more than 3 years old. Sadly, Gamestop has no reason to bargin. These things have yet to sut into their sales, and probably even help the more profitable used sales as we wait unti the savings catch up to the extra costs. With games going the digital route, their days as a software seller are numbered anyway, with the used market being their only use, and even that's limited.