I'm totally against this. In fact, and I say this respectfully, I don't get why so many are defending it. Don't get me wrong, I'm for supporting a good game. However there's a difference inbetween supporting game developers, and supporting greedy and underhanded systems and DRM's. When I purchase a game, when I pay that $60 price tag, I want to own that copy and feel free to do whatever I want with it, and play it whenever I want. When I purchase a movie it doesn't make me connect to Warner Bros. servers, and have me shell out $10 for every person in the room watching the movie with me. Nor would anyone put up with that, yet for some reason gamers seem very willing to, and in some cases ask for even strictor measures to be taken if the developers feel it necessary.
This isn't just going to combat used game purchases, it's going to hurt game rental services like Gamefly, or simply loaning a game to a friend, and make sharing games with a sibling who wants to play on their own console or account impossible.
More and more things like this, or Ubisoft's awful, awful system come out and get embraced by a group of staunch defenders saying it's ok to endure it in order to support the devs. I respect that and agree that I want the devs to get the money they earned. However every year DRM gets more bold, and devs take even more extreme steps to prevent piracy or used game purchasing that hurts the consumers that support them and purchase things legally.
I may be overthinking it, but at this rate one day you're going to go to buy a game and find out you can only download it 4x, only play it if you have an internet connection and are signed in to the developers servers (I mean even consoles are seeing this now, Final Fight anyone?), and be unable to loan it out to anyone without getting locked out of the game (and to say it won't happen probably is wrong as all of these things already happen, just not on one single title).