Like I said many times Natal will do nothing for hardware sales (Same as the PS Wand or Sphere or whatever there calling it). The only thing Microsoft can do is cut the price by $100 on the Elite to have sales better then PS3, but then again it'll only be a matter of time till the PS3 cuts the price then it'll be the PS3 ahead again. The X360 had a year start, sales are going to start going downhill while PS3's continue to go up, it's only natural.
There's not much Microsoft can do. There dead in Japan and there's pretty much nothing they can do to save them (unless they some how get FFXIII, but that looks highly doughtful). There already dying (<--fixed) in Others and GT5 will be the nail in the coffin for that. The only region they have going for them is America, and as big as America is it won't be enough to save them.







