Has nothing to do with those games being 3D ready.
Japan has had glasses-free 3D TVs since 2006 or earlier.
They got a lot of 3D TV channels, including broadcast.
They make all their Anime in pure 100% CGI for the past many years, because they show them in 3D.
But in America, we get the same Anime in 2D.
Good for them. I'm still telling you that those games being on top has nothing to do with them being 3D ready, it's because they're popular franchises on the most popular system in japan (and no the 3DS is not so popular because of its 3D feature)
Then why come no one in Nihon bought a 2DS?