well, there will definitely be a wall that stops the advancement of graphics, and I expect it to come pretty soon. What are developers going to do, make graphics better than real life? That being said, besides new games and genres, the way that games are played is pretty much one of the only things left to upgrade. Like ba11ard said, I think virtual reality is a lot closer than most people think... A modern day virtual boy, for example, would be extremely easy to make and would be amazing...