If this catches on, you will have to insert a username and a password to start your second-hand car, your cell phone, etc...
Game publishers are just trying to take advantage of a market they can't yet control, but surely want to. But they are not lowering retail prices of new games so you can make up the difference by buying the additional content online, are they ?
The problem is, they are focused on greed and stop seeing what's important and that this might actually hurt them.
They should just charge less for each new game sold. I don't know how many of you do do this, but I only buy games a year after they come out, usually when they are at 19,99 Euros. I simply cannot afford 60 or 50 euros for a game. They complain about piracy but don't see that they cannot coerce people into buying overpriced games. And that is a fact they cannot resolve.
Either way, if they want to "play this game", let's do this: buy a new game, create an e-mail account for using with that game, create your profile using that account. When you sell the game second hand, give the account details along with the game; the store or the individual buyer checks online to see if you haven't tampered the account/changed the password, changes it to sometinhg different, gives you the money and the next buyer has the same rights as you, because he's using your former account. That easy, I guess. Or am I missing something ?