They can't get the Wii crowd back.
We were talking about Avatar in an other thread, this is the same thing. People watched Avatar to try the new 3D, but they won't care about Avatar 2.
A lot of "non-gamers" like grandparents and families bought the Wii because it was "video-game but not only", for Wii sports and other motion games supposed to allow them to move all together in front of the TV. They tried, had fun with it for a while, and it stopped. The Wii dropped quite quickly and no other motion gaming experience came close because people don't care anymore. You will find lots of Wiis still in people's houses, not used anymore, families just lost interest after a while. If parents want to play nowadays, they'll just take a F2P game on their phone, no need for a console if it's just for rare game sessions.
So Nintendo can attract a few casual gamers with casual games, but if they expect the Wii non-gamers audience back, they're wrong.