I can understand, because developers should see some of the money from sales where Used Games cut them out of the equation (it would be different if Game Stop paid little royalties to the devs/whatever for each used game sale) and it's really unfortunate.
I don't think an always-on 'net connection is the right way to go about it...but I've also heard rumors that the next XBOX and Playstation (Durango and Orbis, I think?) may cut out physical sales and be online only. Or at least, I thought I heard that once? It could just be wishful thinking on my part. It works for Steam and the PC market. So why the heck not?
So, mixed feelings on this. I support methods to circumvent used game sales, since that takes money away from a couple of Fat Cats down in Texas and potentially back to investors, developers, publishers, etc. who actually went to the effort of creating something for consumers. However, I never think an "always online" approach is the best way either. I think Activision kind of had the right idea where multiplayer could only be accessed from a new copy of the game, or by purchasing an online multiplayer access pass. Gamestop could still sell the game used, and consumers could still purchase the used game and enjoy the single player campaign, but if they wanted to hop online and continue playing (because they really liked the single player or w/e) then they could purchase the pass and enjoy!
Again, it's about where you want your money to go to. Fat cats down in Texas who want to buy the latest Ferrari and continue paying 90% of their employees crap wages (I used to work at Gamestop, can you tell?

) or developers, publishers, investors, etc. who went to the effort, and to some extent risk, to create a new product for you to enjoy and where any profits they receive may be used so they could create something else for you to enjoy. I know my stance on the subject, and I know it probably isn't the popular one, and I'm pretty biased about it...but it's my stance and I'm stickin' to it!

Don't worry, I won't think less of you (if you care) if you disagree with me, since I know a new game really isn't the most reasonable purchase someone can make. And if someone is done with their game and wants to get rid of it, why the heck not buy it off them? Better than letting it sit around doing nothing, and now you have a chance to enjoy it too!