If GTA was exclusive to the Wii U, would it ever be able to push out the sales that it did on the PS3/360?

[Damian.W]

Definitely. GTA is one of those franchises that i it were a Wii U exclusive, people would be clawing over each other to get both the console and game.
Even if it were just released as a port, I have no doubt that the game would have sold over a million, so long as it had features that would entice people to get the Wii U version.