The ship has sailed for Nintendo. They are two years too late, with one of the most unappealing lineups I can think of, and are being already outhyped by machines that haven't even been shown so far.
Nintendo literally has nothing coming for WiiU that could save the console in Europe. At least not from their IP catalogue. Unless they strike Gold with a new IP again, which is totally possible, their complacent arrogance has made sure that they basically did too little too late. It coming back to bite them in the ass now is sweet swet justice, and even as a Nintendo fan myself I can't help but feel a weird sense of glee over their complete and utter failure of trying the same exact trick twice.
Personally I am convinced, the WiiU will be respinsible for a huge contraction of the game market by failing to keep the imploding audience the Wii brought in. PS4 and Xbox3 should do comparably to this gen, but the WiiU will be lucky to even reach 30 Million WW.
Mario has lost it's insane selling power which is all too obvious in the horrible sales of NSMB2 and U, as well as the lack of hardware drive from MK7.
And while ACNL sells gangbusters in Japan, I don't see it selling anywhere near as good here.
But it serves to highlight my point, Nintendo will only be able to save the WiiU from being a complete financial disaster through a new IP or one that is able to comunicate clearly why the WiiU is worth buying and why it's enjoyable.
I think in terms of market impact, the ship has sailed two years ago. Nintendo will never be able to make the WiiU a relevant player in the market and should first and foremost focus on returning to profitability and sustained revenue. I don't see them achieve anything more than that with WiiU.