The reason this is relevant is because I have heard multiple times that Sony is promising PS3 support until "2016" or the like. Also, just as Nintendo's technologically-weaker product started losing steam and the competition (which had been dominated until somewhat recently this generation) started to gain ground, Nintendo releases a new system that beats them at the very factors they excel in.
Furthermore, MS dumped half a billion last quarter into promotion of their half functional, frankenstien-like "Kinect" product (in lieu of a new system), only to be upstaged by both Sony and Nintendo at this year's E3 by all accounts.
Nintendo might just be in the process of pulling off a near level of domination not seen from them since the 1980s. At a minimum, they will be the market console leader for the next several years; that much is clear.