I think that Nintendo Land is a good marketing move to let people know about the new WiiU gamepad, and to stick them with Nintendo's biggest franchises.
It won't be the new Wii Sports. Wii Sports was something totally new, people who never cared about videogames talked about it, it was a revolution! For 'casual' people the Wii was, and is, Wii Sports. (and maybe also Wii Fit)
Nintendo Land won't have the same effect, but it will increase the bundle value and will be well received by the public.