NJ5 said:
It already happens with the IR when you point the Wii remote away from the sensor bar and then back in. That's not very frequent because most of the time you're pointing the wii remote forward. And of course we don't know how much error would accumulate...
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It's not very frequent because, due to this very technical limitation, Wii games have been designed to not mix IR pointing at the screen with big rotations of the Wiimote. Think in more general terms ( sword fighting, rotating objects etc) and those situations would crop up all the time.
As for how many errors would accumulate by relying on accelerometers, I can give you the benefit of the doubt... but the simple fact that Nintendo decided to add an IR camera to the Wii to track positioning suggests that it wasn't an acceptable solution.