Nintendo should push as many Wiis as they can as fast as they can to make the Wii more appealing to third party developers. Even though Nintendo has almost half of the marketshare this generation many third parties are still hesitant to push high quality titles on it. With the Wii pushing sales even more ahead than the HD consoles than past holidays it just makes the Wii more enticing.
And to those who say the Wii is not competing with the HD consoles are dead wrong. There is a lot of market overlap according to NPD http://www.joystiq.com/2009/09/15/npd-provides-stats-on-game-promotion-platform-cross-ownership/
There is no way Nintendo will meet their sales projections without a price cut and in the long run I believe Nintendo will make an even bigger profit. Why? More consoles sold correlates with more software and accessories sold. And software and accessories sold = more profit for Nintendo. The most important thing for Nintendo is getting more third party love for the Wii and publishers love price cuts on hardware.
Just imagine the Wii selling 70% of this generations' hardware this holiday, that would convice more third party developers to drop more and better games for the Wii than otherwise would have if it sold 40%.