Some activity is always better than no activity. If Wii Fit can keep a user entertained and interested long enough to see results, the user wins. As for what happens after... That's another issue.
Maintaining fitness isn't like tuning up a car. You're not finished after the tune up so long as you keep putting mileage on it.
That will be the real test for effectiveness. A gauge to see how long the average buyer uses the program. Otherwise, it's no different that the typical exercise equipment that ends up in the closet.
Even if just used as a scale/monitor, when people stop exercising and eating more they tend to stay away from the scale because many would rather live in ignorance, while knowing full well that they are gaining weight.
If they didn't, they'd be weighing themselves regularly to confirm no change in weight.







