How Realistic Should Games Get?

[Koh]

I've been hearing about an anime called Sword Art Online from the same thread topic I've made on other forums, and I'm assuming it has that super high level of entry for the players into the game world. I've also heard stories that they're actually working on nervegear, to have you get an actual feeling from interacting in the game world. It just frightens me a bit, that games will becomes so realistic, that there will hardly be much distinguishing from the Real World and the Virtual World, or that having pain in the Virtual World causes you to feel pain in the Real World.