Give something to someone that isn't interested in buying it themselves and expect them to be interested in it? I think the basic premise of this study is flawed.
Also, this study breaks many of the rules to scientific experiments, like having a control while you test. This study assumed the people kept the same lifestyle before and after the Wii. In an 11 month time span you change your lifestyle drastically just to accommodate weather, let alone holidays based around eating and fasting.
To be a true study of the life changes any exercise device can bring to a household, you need to find households that are incredibly similar and introduce the device to a group and leave at least 1 household without the device and under observation. You will actually have comparable results, unlike this study of assumptions.