I wouldn't want to play Cooking Mama or Trauma Center at all. Played it on my sister's Wii and I got bored out of my mind.
I can understand the fun and variety part, but what I said still rings true. The Wii has no hardware for developers to keep working on and no online service to patch games or even bring downloadable content to gamers. All Nintendo can hope for is that developers can still come up with weird and wacky ways of making different games that only the Wii Remote can control.