The XBO has two main advantages that would prevent this from ever happening.
1. The price. The XBO is selling better at $500 than the WiiU is at $300. That proves it's a far more appealing product at it's core. Like the PS3, it has a lot of room of pricedrops. The WiiU is already the cheapest next gen console, if it's not selling now then I doubt it will sell at $250, conversely a $50-100 price drop for XBO would go a long away.
2. 3rd party support. A steady stream of 3rd party support will keep the XBO from suffering the same draught that WiiU constantly has. Nintendo has to rely purely on 1st party games to sell platforms, and they can't release more than 3-4 major titles a year. That leaves months in-between major releases where there's nothing coming out.
At this point anyone who thinks the WiiU can still take second is probably crazy. No offense, but it's not happening. XBO will take a comfortable second place this gen while WiiU will fall to a distant 3rd sometime next year.
Sigs are dumb. And so are you!
