The new Onimusha game should come out for Wii.
The sword swinging combat in that game is more deliberate, easier, and slower than let's say something like DMC which would cause people's arms to come off if they tried to play DMC[3] on the Wii. That, or you'd lose 800 calories per play session.
Onimusha could work though.
That, and sales wise Onimusha has died out. And I don't really think your common HD 360 user gives two shits about that series anymore. The only audience for Onimusha is Japan, and they have been backing Onimusha well (even Dawn of Dreams did well there). And of course, the Wii is the most successful console in Japan, so...it sould work out.