Look, MS and Sony are focusing on "bigger, bigger, bigger." You don't see MS or Sony trying to promote "simple" games, both are trying to get things as jam-packed as hell so they have more bullet points. That's all well and good to a point, but Nintendo has been around longer and can see the bigger picture.
Anyone remember how Nintendo came into power? That's right, the industry got too damn full of itself and imploded, like a neutron star. So how is Nintendo hedging its bets? By showing investors and gamers that they understand bigger isn't always better. I don't know how much money the fancy new Xbox and PS3 games announced cost to make, but I can guaruntee you more money is at least spent on art. Now, how many more sales will it take to break even? What kinds of risks can a publsher take with those odds? Now imagine if people suddenly start buying fewer console games (it's happening in Japan!)? UH OHS! Publishers need a back-up plan!
I initially had a reaction similar to some here--perhaps the first time I became really worried that Nintendo was throwing out the game styles I enjoy. I hate Wario Ware, didn't enjoy Animal Crossing, and couldn't care less for Electroplankton! Then Bloodworth reminded me that this is the same Nintendo that is making the Twilight Princess and New Super Mario Bros. We'll see epic games, but Nintendo also promises to push cheaper games and strange peripheral titles, unlike Microsoft and Sony. Frankly that's a promise to third parties as much as it is to us, and they better keep it. Heck, if shying away from 3 huge-budget teams = more classic sidescrolling and crazy new games, sign me up!