Something that to some small degree worries me is that video game preservation is all but impossible for online-only services. WoW and its ilk have played a large role in the evolution of video games, but in ten years we're unlikely to be able to recreate anything like the experience of playing the game at any stage.

I don't think there's a good solution, especially without market leaders such as Blizzard, Sony, or NCSoft taking a pro-preservation stance. Legislation to protect the rights of reverse-engineers seems troublesome, and existing copyright law makes any kind of expiration period ineffective.