I'm surprised people continue to believe that 3rd parties simply don't know what to do generate hits on the Wii. They do. Unfortunately, protecting their PS3 & 360 investments, preserving the direction their trying to take gaming, & ensuring that they have at least 2 players on the market that are willing to fight over them all take precedence. That's all. Making thoughtful AAA "core" titles on the Wii on the regular puts that in jeopardy.
EA saw evidence on this early on with the Godfather game (and that wasn't even a AAA title) which is probably part of the reason why the PS3 got the sequel. Imagine the results if they regularly released games that not only were perceived to have better control schemes, but at a passing glance looked on par with the HD versions. This is why third parties, EA included, aren't putting much effort into Wii games & often try to differentiate their core titles as much as possible from their HD counterparts. BTW, Ubisoft admitting that they're using Wii profits to help fund HD projects is also evidence of this strategy.
To those who suggest that Nintendo should begin to fill in the gaps left by 3rd parties, let me put it this way. They tried this during the N64 era, mostly out of necessity, through Rare & folks like Left Field. They were going to try again in the GC era, but Retro turned out to be a mess at the beginning & needed to be scaled back. BTW, why haven't we heard from them in 3 years? Anyway, my point is that Nintendo is willing & probably is taking steps to go in that direction. However, they're Nintendo. They need to do everything their way & at their own pace - even when it doesn't make sense to the rest of us