So do people actually still think NSMB Wii isn't pushing hardware?

[Demotruk]

Nostalgia does not simply mean positive memories. It describes a longing for the past. If you say the game sells by "nostalgia" because people remember Mario being awesome, that's misusing the term nostalgia.

I don't think anyone disagrees with the idea that old memories of Mario are helping with the sales (much more than NSMB DS, for some reason...?), so it's just a semantic issue.