^Mountain lakes prove that what water does locally does not imply much about global topography :) Or in our terms, that the relation between sales and evaluation of products could very well work for small subsets (say between all FPSs on 360) but not work across big chasms due to other factors.
That said, while the Wii market for FPS games has not proven easy or extremely rewarding yet, it's still probably profitable enough for a big franchise like COD to venture in.
Of course I don't agree with those saying that it's Activision to call all the shots on the issue. If IW for some reason felt that going for a Wii version in parallel with the PS3/360/PC one would have been stretching out too much, Activision would just shut up, get those versions out first and maybe think about a later port by some other studio.
When a studio like IW is basically a goose laying golden eggs for you, you don't mess with the development process potentially giving you 10M+ sales to add an extra 1.5M (at a lower profit per copy).







