Here in England, the used games market is really not as big as over in the States, but when you do see it, the prices really aren't very low. I go into HMV and the "re/play" section has about 10 games in it, go onto Amazon and their marketplace used games are only about 40% off in the best cases.

The only real bargins that you can get, occurs about 6 months after release; but these deals are all for new games, and the best games sold used about a year after release, aren't much less than new games, so what is the point paying for almost as expensive used games.

So in total, I see no reason why used games can ever become a problem in the UK, and I don't think that the mindset is there for used games to become the norm for most of the population.