I don't know why people are making such a big deal about this. Reggie's PR is just horrible, and he probably should have just skirted around the questions (mentioning upcoming titles, etc.), but he didn't actually say the Wii U would outsell the PS4 or the Xbox One:
"The dirty little secret is if you look at life-to-date numbers, between Sony and Nintendo they’d be pretty close in terms of PS4 vs. Wii U, with Xbox coming in third place. I think it’s going to be a three-horse race for the balance of this cycle".
Note that he mentions the current standings instead of weekly sales, and the balance of this cycle (which is very ambiguous). While the other two consoles are smashing the Wii U in sales overall, all three consoles are still in the process of building up exclusives and a broad range of experiences that would not be possible on the previous iterations of hardware. Apart from the hardcore fans who adopted early, people are still waiting for enough reasons to feel comfortable with upgrading. His mention of the "balance of the cycle" could easily be interpreted as a reminder that the Wii U will compete for some marketshare and not not to dismiss it so easily. He didn't say it would be a huge success or anything.