I think a lot of people here missed the point: the question isn't what's technically possible -- obviously there is still significant room for growth there -- but rather, what is economically feasible.
And no, we don't have much further to go til things slow way, way down.
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">







