I can't see how this survey can be accurate ...
You will often see it mentioned (in relation to politics) how impossible it is becomming to accurately poll voters who are 18 to 35 because so many of them have given up land-lines in favour of cellphones. The obvious point from this is that single (well employed) people are both far more likely to give up their land-line and to be early adopters on a videogame system; these people would be dramatically under represented in any telephone survey.
Another factor is that the Wii is still a pretty rare thing for people to own so they would have to call a massive number of households to get enough Wii owners to acurately measure the userbase.
The final question is, when a 'Nuclear' family owns a Wii who is credited with the ownership? The Mother, daughter, father or son?
