Not that I want this to happen (or even think it's necessarily a universal benefit to developers; I, and I'm sure many others, am much more inclined to be more experimental in picking up a cheap used game than a full price new one), but I'm not sure it would really affect Sony/MS's console sales much. Isn't the average attach rate for most consoles between 5 and 10 games? I'd expect of those 5-10 that the vast majority are bought new. If that's true, then the people buying tons of used games are the enthusiasts... probably the easiest people to convince to buy games consoles!
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Who knew the Rivalry Rumble would be so predictable? SuperNiceDog, that's who.