I'm going to disagree with you here. The only new game concepts I've seen on the Wii skew towards the casual side of gaming (Wii Sports and Boom Blox being two of the best examples). Quickly perusing my Wii catalog, I don't have a single game (outside of "casual" games like Wii Sports, Wii Play, and Boom Blox) that introduce any new concepts. You might argue that these three games hit both demographics, but I don't think you'd argue that these were "core" games, as defined by your argument above. The best "core" games on the Wii (Mario, Zelda, Smash, Mario Kart, Metroid) take existing concepts and graft on the Wii controls. The same is true for the top 3rd party games (RE4, Zack & Wiki, No More Heroes).
I would argue that the true advancements in the core games mostly revolve around online aspects such as drop-in/drop-out co-operative play, Forge, Saved Films, and DLC. And yes I'm well aware that games such as Boom Blox are doing things similar to Forge. That's the innovation I've seen in the core space, in addition to the genre refinement that happens on new generations. Most of the gameplay innovation I've seen this generation revolves around the more casual titles on the Wii.