What can Nintendo release on Wii now that sell more than 10million units?

[Metallicube]

Zelda Wii will be close but might pass 10 million.

The flagship vitality sensor game (Wii relax?)

As you said, a Pokemon MMO, or RPG in general would certainly do it.

Another 2-D Mario.

Any further sequels to Wii Fit, Wii Sports, or Wii Play.