Hate to be the bearer of bad news but, the game is not a hit in Japan. First day sales were only 10,000, and this isn't looking like the type of game that'll have long legs.
Of course considering how NCL announced the release date only 3 weeks before release, it seems like they weren't expecting huge sales in Japan though. Since this game was obviously made with a Western audience in mind, it's going to be the North American and European sales that Nintendo cares about.
As long as NOA and NOE market the game right in their markets, I think the game has the potential to do well in the rest of the world. Not huge Mario or Zelda level numbers or anything, but I could see it getting a respectable sized audience in the end.