There is sports for that
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Anyway one of the things that videogames brings is (or used to be) easy acess anyone could have minimum skill in just a few minutes (even in larger tuturials it just take 10-15 minutes, unless it is a RTS), this way it would passs hours before many persons could have minimum skills.
Frankly, I don't see why this would be any harder than what the Wii already uses, which is arguably the easiest to get into of any interface available. 80 year olds have no problem whatsoever with bowling, tennis and so on. Increased precision won't change that, only give the game designer sharper tools to work with.
And yes, the idea is to move towards sports in terms of control. Sports are easy to get into, yet the offers depth that engages potentially for a lifetime. Add to that the ability of computers to generate virtual worlds of storylines and challenges, and you have a pretty compelling package.
There are more problems than the controler ability to recg motion, the medium (TV) will not be an advantage or no force resistance from or "foes" comes to mind. You still can add a lot of "special movements" that make more damage and such, like in fighting games, but by doing counter-life like movements.
This is true, but the same is true if you play via keyboard and mouse or a gamepad. Only your input in that case isn't anywhere close to being life like in any way.
Again, (Obonicus, take note) not all games are suited to motion mapping, and not all actions in all games. This is not a problem, just as games on PCs aren't ASWD+mouselook for all possible actions in all possible games. Again, this is no change relative to the current state of the art. Good control, regardless of how it is used is generally better than sloppy control. But it is critical with some genres of games, and enables new games that would be frustrating or impossible without it.
A game like tennis is probably the best candidate to have both kinds of controls, easy to market with the reasons you list, but frustation free. I really hope that at least some games try it.
Tennis, bowling, golf, table-tennis, fly-fishing, base-ball, whipping, sword/mace/axe/dagger fighting are all obvious targets. And better control would be a huge improvement in all shooters, where the current Wii-mote is arguably better than a game-pad but clearly less effective than a mouse. (I haven't kept track, does anyone use the Wii-fit pad for surfing, snowboarding or skateboarding games? Otherwise it's the same idea. A, use a method of input which can mimic the real mechanic. B, higher precision enables better in game control and skill building.)