The Ghost of RubangB on 10 April 2009
Wii Sports is one of the greatest games ever made, one of the most revolutionary games, and one of the biggest global cultural phenomenons. It is up there with Pac-Man, Donkey Kong, Super Mario Bros., and Tetris, and that will never change.
It could get outsold in the future due to population growth and market expansion, but it will most likely be a really long time before that happens.
But I highly doubt a new gameplay interface will out-revolutionize Wii Sports for this generation, and most likely not until we get something completely new and different like smell-o-gaming or virtual reality. Anything with WiiMotionPlus is just expanding on the revolution of Wii Sports, and could be way better but not as revolutionary.
