Wii U definitely needs a jumpstart. It's sales trend is brutal. Nintendo is very fortunate that they are out first and have time to react, and that this is all bonus install base sells right now. It's not inconceivable that Wii U versions of titles like AC4 or Watch_Dogs could outsell PS4 or XI versions with the much larger install base. And the existing install base will push their friends to buy the system. Wii U needs a strong July-Aug-Sep-Oct to take advantage fully of its head start.
And again, this sales trend is pretty similar to the last first-launch system, the XBox 360.