Wait:
my personal feedback about Vita's sales: very negative. It's struggling to sell ww, even in Japan. There are reasons, but it's doing bad in all the markets.
And comparing it to 3DS saying "3DS too isn't selling very hot" is laughable IMHO (not repeating the best DS numbers in the West, but being still able - thx to key franchises - to put overall sufficient numbers in the West and great numbers in Japan is VERY different from a console that is NOT selling at all or near to that) especially because not only the actual results are much different, but also because the reasons why 3DS is selling are hardly repeteable by Vita (first party franchises, strong DS brand against very weak PSP brand awarness in the West after the initial good period, price, kid demographics and so on)
I'm just saying that in the West, we still don't know which could be the reaction of the market under determinate importante circumstancies: holidays purchases + key western-franchises (like CoD or AC and so on)
Judgments after Xmas 2012 will be more "reliable", imho