Shigeru Miyamoto has explained to gaming press that the underlying technology behind Wii MotionPlus wasn’t possible when the Nintendo Wii was originally released.
“It’s a continuous evolution. Not all the Wii software requires MotionPlus, so it is appropriate for us to position it as a peripheral, also, it was not technically feasible for the technology to be realized with such a compact size. The fact we are now being able to sell Motion Plus at this price, at this size, is the result of technological advancements in the field of microelectro-mechanical systems, which took place after Wii launched.”
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