Anyways, 6 months is plenty. Nintendo's TV marketing is not going to be great anyway, they're just not good at that, DS had terrible TV marketing and messaging at first, the Wii is the only system they've probably launch since the SNES that had good launch commercials, the irony being it needed TV marketing probably the least of any of their systems. Wii U, 3DS, GameCube, DS all had poor TV marketing, even the Super NES was badly outmarketed by the Genesis and N64 by the Playstation. They've never really been great at that type of marketing.
They need better launch titles than NSMBU and Nintendo Land or at least ones that generate more buzz, and they need Android app functionality for kids because kids are not going to carry around their regular tablet AND an NX. NX needs to function as both for that crowd.
And they need Monster Hunter + Dragon Quest for Japan.
Those are the main things for this device.