You'd have to look at hardware sales to really see the impact of Mario Sunshine.
Before the game's release, the GameCube was selling around 4,000-5,000 units per week. Ever since Mario Sunshine's release, it has been selling no fewer than 8,000 units a week and regularly tops 10,000.
GameCube's share of software sold on a weekly basis has also increased, but I don't have exact numbers at this moment.
In Japan, at least, I think Mario Sunshine has done what it needed to do.
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