Preventing the sale of used games, along with the recent tendency to never reduce the price on old games (even after several years), is just companies raising prices by 200% just because they can. To the industry, you buying a single game new and twenty used in a year is no better than you buying just that single new game, as eliminating the used market would cause. I buy games used because I don't feel they are worth $60, or dont want to risk $60 on an unknown product, not because I'm not interested in supporting the developers or couldn't afford to buy them new.
Ideally, no used game market would mean developers would actually reduce the prices on new games sooner to cater to the market that obviously exists, as they'd still be making something upwards of 90% profit on each sale. Unfortunately, if the current trend of selling two or three year old releases for $60 suggests anything, publishers are of the attitude that if you weren't willing to pay $60 when the game launched, you shouldn't ever play it.