A good first indication to see how this will sells would be to know how many of the Wii owners on this forum are planning to buy The Conduit.
People in this forum are a lot more hardcore than most Wii owners so if most plan to buy it this bodes well, if not this is not a good start. ( it's fairly obvious to see that most PS3 owners on VGChartz purchased KZ2 and most Xbox360 fans purchased Gears2, so what about Wii owners ?).

As much as I'd love for the Conduit to get massive sales and outdo World at War, I'd say it's entirely possible for WaW to outsell it. I mean... WaW on 360 outsold Gears 2, and WaW on PS3 outsold Resistance 2 and Killzone 2 is selling slower than it did (though, I suppose WaW had the advantage of releasing over the holiday season), and these were all games released around the same time, targeting the same audience, and so on. Resistance 2, Killzone 2 and Gears 2 were all heavily hyped exclusive shooters that were all outdone by World at War, and the same could eventually be true for the Conduit.

I hope it isn't, however.