Well, I'd say they'll sell 15 m 3DS' at the most - or 16 m... 18 seems a bit much tbh; but it all depends on how it'll sell in the West.
10 m Wiis/WiiUs seems... plausible... I'd say 8-10 m myself, but it depends on WHEN it's released. If released in October it'll hit 10 m for sure, but I'd say it'll launch in mid-November.
And regarding the DS... Yeah, somewhere between 2-2.5 m copies sold.
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