Thats a pretty naive statement Just because they get the same end result doesnt mean you can sue for intellectual rights Its like saying DaimlerChrysler should sue all other car companies for breaching intellectual rights for copying their idea of a motorcarriage Or the Wright brothers estate should sure plane companies for copying there idea You can only sure for breach of intellecual rights when the device uses the same mechanism to achive the end result and such things can be legally licensed Im willing to bet that Nintendo dont own the rights to the motion sensors and license them as Sony would The only exception would be if they designed them themselves