The only reason I could see that Microsoft would make the choices they did was to save on cost or to be easier to scale up to 10's of millions of units a year by getting higher/cheaper chip yields faster than Sony can with basically identical chips. The only way that Microsoft can capitalize on that advantage will be to actually have a lower price faster since they don't have a one year head start this time.
Nintendo's only shot right now is to cut price on the Wii U.
Just remember that historically the magic number for console sales is $199. That's why the Xbox 360's entry price is $199 now and the Wii worked so well at $249 with a bundled game (basically $199 console + pack in game).
Mobile devices the sweet spot is more like say $150, which is why the DS did better than the PSP, 3DS than the Vita and so on.
Price makes a huge difference on consumer products and getting to certain price points can be the difference between success and failure other things being basically equal.