Wii Party will be a huge hit software sales wise but it will do little to move hardware. Pokepark may move a few consoles. Metroid Other M should reach a million sales, but also won't be a hardware mover.
The key titles that will drive momemtum of hardware sales are Kirby and (especially) Donkey Kong Country. Being a popular franchise that has been put to sleep for almost 15 years, there is going to be a lot of pent up hype for this title similar to NSMB Wii, and it will move similar numbers to what NSMB Wii, though not quite as many. Kirby is also still a very popular Nintendo franchises, and 2D sidescrollers as a successful genre, so the game should drive momentum too, though not near as much as DKC.
I doubt Wii will have another record breaking 4.3 million in America in one month this year, but DKC and Kirby could push it to close numbers, perhaps something like 3.5 million.
