According to Reuters, analysts predicted the Wii did well because adult gamers wanted to introduce their children to gaming. These "Nintendads" helped sell a lot of units. Oh please, "Nintendads" wanted the Wii for themselves. The kid was just the add-on peripheral excuse that allowed the wife to let them purchase the console.
Beyond Nintendo, Sony and Microsoft are clearly fighting it out for an adult focused media hub. Although neither is succeeding in making that all-in-one unit, we don't really care, as long as they focus on the games. All we know is as this "Nintendad" generation takes control, we'll see a significant decline in silly game legislation.