Twilight Princess, from the top of my head, sold 1.6m and 7.1m on GC and Wii for a combined 8.7m. Ocarina of Time is a million below that. I agree being released on a new console as a launch game will help Zelda U a lot like it did with Twilight Princess and I think it would be a shame if Nintendo wasted the sales potential by only releasing on WiiU.
So it would be better, but I wouldn't dare going as high as the highest selling game in the series. Twilight Princess did ride the Wii-wave, so the NX would have to be pretty successful as well. Reception so far has been good, but the end product needs to be praised and not unimportantly, hype for the game would have to be amazing. To throw something out myself; I'd say, if released on two systems, a lifetime of 6-7m is a safer bet, with a 2m-4m+ ratio between the systems.
As a fan like you though, the higher the better obviously, I'm still waiting for that first true 10m seller!







