Wii U WILL BE THE LEADER of the 8th Generation Consoles BY FAR. It will outsell the XBox One & PlayStation 4 HANDILY throughout the generation.
Oh & you want a number? Here's one for you: 12 million Wii U's sold by December 31, 2013.
Thats a pretty big, esimation. To win a console war, a platform needs games and good sales. I guess Nintendo will have that sooner or later