After 2 years on the market, the DS started to have more software that attracted core users. It's probably time for Nintendo to do the same on the Wii. That said, a new Wii series game is also possible, Nintendo will not abandon their expanding audience.
Castlevania Judgment FC: 1161 - 3389 - 1512
3DS Friend Code: 3480-2746-6289
Wii Friend Code: 4268-9719-1932-3069