Except the DS outsold the NES/SNES/N64 combined. The Wii sold 1.5-3x what any one of those consoles sold. Plenty of kids this past console generation grew up with Nintendo. And as the numbers show arguably way more did than in the NES era.The farther removed we get from the NES/SNES/N64 era the less relevant Nintendo becomes, the newer generation coming up does not have that nostalgic connection to Nintendo's cast of characters.
Those that do have the connection to the characters can easily get their fix on a DS console and there is a library of quality 3rd party games to boot....