I don't think most people realise what the unintended consequences of this could be.
I know I said we should agree to disagree but you know what I'm like
I maintain that people with this viewpoint are massively over-exagerating the effect it would have on the market. It's slightly different to trading in physical games, sure, but not so different that it would have a completely different effect.
The availability of tradeins and used games for 25+ years has not caused anything like what you are suggesting would happen if consumers were allowed to once again sell things they dont want anymore.
It remains limited by the same thing has stopped the market being flooded with infinite cheap used games on console - only one person can have the game at any one time. For a used sale to take place, a corresponding new sale must happen *and* the person who made that new purchase must not want the product anymore.
As I keep saying, I doubt I'd sell any of my games and I'd imagine most people here are no different. I like playing them.
Infact what it MIGHT cause is for people like me to buy MORE new games. After all, why not take a punt on the latest MOH? If its as crap as the internet says I can sell it on. Who knows, I might like it and keep it. Currently I don't buy games like that because I want value out of what I buy.
The massively higher margins on digitally distributed games are more than enough to compensate for the minor effect this would have on new sales. Physical games have a MUCH lower margin yet STILL survive with used copies in circulation.