Actually, I think it would be a pretty smart move for Sony and Microsoft to block used games.
There are no other gaming platforms that allow used games... and they all have flexible pricing. You see more and better sales on those platforms too. Secondly, if you're going to sell your console at a loss and your intent is to make up the difference by charging a royalty for games in your platform, then do you even want a customer who is going to buy primarily used games? They probably don't even make $1 off a customer like that. I'll bet they don't want those customers. But the thing is, where are you going to go if you want to game and want to buy/sell used games? If Microsoft and Sony shut that down (they'd have to do it together), where are you going to go to do that? There is nowhere else. For all of te bitching and moaning, I'd bet that most gamers would suck it up and deal with it over time.