Oh noes! Wii is doomed.
At the moment, Natal is a peripheral that can only control a very limited variety of games, is extremely inaccurate and has a total of 0 games for it.
None of those problems are insurmountable. But it will be very hard for MS to convince devs to make games for the peripheral until a lot of consumers buy it, and hard for MS to convince consumers to buy it unless it has a lot of games.
Now assuming MS irons out the bugs with Natal, and produces a game of equal quality and mass market appeal as Wii Sports, Fit (or presumably WSR) which have been used to convince consumers to buy the Wii, Balance board (and WM+)
Nintendo will continue to produce the best games in their companies history, they have the release of WM+ very soon in Japan, as well as new colours coming out and the Monster Hunter bundle. They are also starting to get a lot of good 3rd party support. If MS starts to gain marketshare then Nintendo could drop the price. The Wii was making a profit at its current price 2.5 years ago.
As for the press thing you mentioned. You are very much mistaken
Yahoo praised the natal. This is neither surprising, nor important. Yahoo realised that their sites have a readership of about 3 people a year, and are trying to suck up to MS so that they can get bought out and the CEOs will retire
CNN praised Natal, but CNN always praised MS whatever so that is no change from before and thus not a concern
Most gaming sites I have seen that don't include the words microsoft or xbox in the url are cautiously optimistic about nNatal