Now that the Wiimote can now do pitch roll and yaw combined with the accelerometers it can do exactly what we all though it should have done in the first place but couldn't do with the accelerometers alone.
The Keyword here is Dead Reckoning. The system knows the Wiimote shouldn't be more than 2 meters away from it's calibrated position (If it isn't, maybe someone should be using a strap) so all it's estimates as to where it is should effectively render the system 1:1 in relation as to where it thinks it is over short periods of time.
Since it isn't traveling far and not going to be used at the North or South pole errors that appear in aircraft gyroscopes are going to be less evident. Anyone who has done a SADIE check will know what I am talking about. looked up the product in question Since it's a RATE gyro it doesn't care about drift, only how many degrees in the X/Y axis it passed through in the last 1/140th of a second. Also, my guess is that every time it gets a good look at the sensor bar it gets re-calibrated. It isn't a true gyro, but along with the other sensors, it is good enough for gaming.
As potentially painful as it has the potential to be, they need to integrate this into a Wiimote V2.0. They have the add-on to upgrade existing controllers. They do need to make this standard. Yes I am telling Nintendo to do what Sony did with PSX and re-standardize the controller. They can do this by releasing Wiisports 2 as a pack-in. Bigger better badder.
Here is the product in question
http://www.invensense.com/products/idg_600.html It's quite clever and it's Nintendo Tough.