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

[JRPGfan]

I voted 30-40m.

If the homeconsole edition of the NX, sells over 30m, Id consider that a success.
Nintendo has had this downwards going trend of selling less and less consoles.
If they can turn it around from the Wii Us 13m -> 30m+ with NX, that would be a success.