I've been Sony all the way ever since PS1, but I won't be in line for the 4 if the do this.
The reason people, I at least, buy games used most of the time is because it's a crappy game and they don't want to risk paying full price only to regret it. The other reason is because most of us just can't afford to shell out $60 for every single game that comes out. If you do this, thus taking away both of those opportunities, people will be afraid to try new games, and therefore won't buy them at all. So you'll actually LOSE money.
Honestly, I'd rather they raise the price to $70 than ban used games. But then, they were probably going to do that anyway.
Draco416's comments