It will sell a lot better than other "shooters" on Wii U, but that's not hard to do. If it manages 1 million in sales it'll be 4x the sales of the highest selling shooter so far. But I don't see it selling 1 million. It's a rare game that's not attached to a multigeneration franchise that sells over 1 million on Wii U.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix