The unfortunate fact is that the consciousness of most of the "gaming press" and even many of the players is dominated by publisher and hardware-maker PR. If game companies promote certain hardware or software features, or advertise their products in a way that presupposes a certain value system, the "press" and many of the players will internalize those values/criteria and apply them in their own reviews, coverage, evaluation, voluntary "word-of-mouth" viral marketing, etc.
In a perfect world, if developers could cheaply make games for Wii, they should just as well be able to cheaply make games with "Wii-level" graphics etc. for PS3 or for high-spec Linux PCs, etc. After all, the stronger hardware can do everything the weaker can, and in fact allows them to not worry about optimizing their code so much which leaves them more time to spend on the gameplay, story, visual and musical style and also may allow them to write higher-level code that gives them more creative flexibility during development.
However, in the real world, this won't fly because so many players, especially the (mostly gullible and stupid) "early adopters", evaluate software above all else for how well and how flashily it showcases their hardware, basically because the hardware manufacturers and their lackeys in the "press" tell them they should.
So now Nintendo is trying to associate different qualities with its new hardware --- accessibility, simple fun, etc. --- and is aggressively promoting those qualities as the true criteria for evaluating games. Gamers and "game journalists", being mindless zombies, will start to internalize this new aesthetic. It's equally bullshit, of course, but at least it's a different flavor of bullshit, and developers now have their choice of two bogus value systems to work around. Most truly visionary designs won't fit into either, of course, but one might well be a better fit than the other; they can at least pick their poison, and when different victims are susceptible to different poisons to a different degree, I don't see how that's not a good thing.