What I think would kick ass is if the top screen had a small wheel-like attachment at the bottom which enable the top screen to turn 180 degrees. Nintendo could then release a small NDS a controller ( to make up for only needing one NDS and cartridge for two people to play a game) and the controller hooks to the back so 2 ppl could play on one. Also not all games would feature this option, as well as just using another NDS would make the gameplay better. This may help discourage everyone from getting the controller and buying an NDS. (That just seems like what Nintendo would do) I don't know if this is feasible since Nintendo likes to complicate things so it forces people to buy more products for more efficient play. I still think that would be a cool idea.