For tablet games. For controlling an avatar on a TV screen, natural motion can prove very easy. People naturally move their hands and head playing games, but no-one's incorporated this. GT5's implementation of head tracking is extremely lame, and yet head-tracking could have been used back with EyeToy.
If anything, it disproves that. Marx et al already discussed in a fair bit of detail that the performance needed to do something like that on PS2 just was too high. Now the PS3 can't even do it very well unless you have a neat even background, and in GT5 it is only available in Arcade mode because in the other modes there weren't enough resources left.
Developers are extremely slow, no doubt because they are cautious. But they also make silly mistakes. Uncharted had random sixaxis elements that just didn't gel, and so ND ditched it with U2. EA haven't incorporated sixaxis into FIFA despite it being an extremeyl natural fit.
I thought the sixaxis controls were fine in Uncharted. What developers came to realise however is that many hardcore gamers have thumbs that connect with analog sticks like Navii with their horses and dragons (or significant others).
What you see now, however, is that when they do implement something like that in a big title, they make it optional. And that's probably a very wise decision. Some people love those options (like me), others don't. I personally don't need many games that make good use of something to call it a success - in that respect it is just a matter of definition. In the end you're just going to see diversification.
What I do realise is the importance of multiple platforms having overlapping features, as well as having competitive first party titles, and SDKs that make something easy to implement. That is the one thing that will make sure that third parties will be interested to try something. Just as important is that there is room and opportunity for small developers and projects to experiment and offer their results to an audience.
No, I just don't see 3rd parties producing much of worth given past opportunities. Potentially game changing techs have been left gathering dust. It'll be down to Nintendo to generate good ideas and the rest with slavishly copy, but that means no decent use in the core games like shooters and sports sims because Nintendo don't make these. The only possible caveat would be Madden, which seems a natural fit to set motions for players prior to a play.
There have been plenty of examples of succesful experiments in all areas. In Nintendo's case, even despite being last-gen hardware they did get plenty of titles to support the Wii-Mote properly for shooters, but the shooter audience stayed where the HD graphics are. Only now with Move implementations are we seeing that technology mature (Guerilla did some awesome things there) in the proper 'hardcore' shooters.
I don't think it matters much what anyone thinks. Nintendo showed with the Wii that there is a huge demand for a better pointing device on consoles as well as accessible motion stuff like Wii Sports, which is just good fun and extremely accessible. Sports Champions for PS3 was one of my gaming highlights of this generation, despite the B-level package - the gameplay was AAA quality for me, unique, and made me feel great.
I have my reservations about Nintendo's setup for some multi-platform applications, but at the same time I see a myriad of unique opportunities in the area where the Wii has always excelled, which is local multiplayer, and Nintendo has already shown this E3 that they are seeing some great ideas with it too. And fortunately for many of us, there are also third parties starting to show a good business sense with motion gaming, at the forefront of which is Ubisoft, who is now making more money from Motion gaming than Nintendo themselves on their own platform, or Harmonix with their dance titles for Kinect.
And if I read the trailers right, most of them also realise that for shooters, nunchuck plus Wii Motion+ will do just fine, and the WuCon can be used for tactics and other cool stuff. Which I think is great.
