So wouldn't it be cool if somewhere in the distant future MMOs become more advanced, and you could actually simulate your mind into the game, as your own character? It would be so realistic your mind is convinced it's practically the same thing as reality.
Only downside is due to how your mind cannot tell the difference between reality and the MMO well enough once immersed, all the harm you take in the game will feel like real pain, and might even result in an actual fatality if not careful enough.