Depends what you mean by ''save''!?
Wii U want die like a Dreamcast, Wii U will be on the market until his successor arives, end of 2016, or probably 2017.
Vith more exclusive games, more marketing, $50 price cut... Wii U will be great secondary console for PS4/XboxOne/PC owners, and must have console for all Nintendo fans and family players.
I am sure that Wii U will pass 30m.