Well, I don't see what nintendo can do to save it, but if someone can do it, its them(see 3DS). But, sony and microft can save it, if they want. If they decide to stop production of their consoles, nintendo could win with ease.
"Hardware design isn’t about making the most powerful thing you can.
Today most hardware design is left to other companies, but when you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective."
Gunpei Yoko







