The XBox 360 had a worse launch, had serious supply issues for the first part of 2006, was facing a massive PR problem with the RROD, and still sold 6.8 Million units in 2006 ... The PS3 had a worse launch, an insanely high price and strong competition still sold 7.8 Million units in 2007
IMO the most realistic sales range for the Wii U in 2013 is 8-12 million units; and I think it is far more likely that it would pass 12 million than fall short of 8 million
People like to not think of this; don't remind them of those launches! Apparently they can't be trusted when predicting future Wii U numbers ;) If EU picks up I'll make the prediction that Wii U will sell 12m units in 2013, but I'm quite sure it'll do 10m right now.
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Furthermore, I think VGChartz should add a "Like"-button.