How many NX's does Nintendo need to sell for it to be considered a success?

[JustBeingReal]

Depends entirely on what NX is.
If it's a console then anything better than Wii U would be a success for Nintendo, if it's a handheld then 3DS numbers would be good and if NX includes both then I thinking combining those numbers together would be good.

May be better to ask this question once we know exactly what NX is and what it's made up of.