The electronic and gaming industry, both hardware and software, a lot of times wind up having production or shipping delays. That's why prepaying is a sometimes dangerous concept, especially if you are the impatient type.
In all fairness to Nintendo, I don't think they thought that the Wii was going to do as well as it did. Given that it was the new kid on the block, they thought there would be enough time to get production up to snuff before it exploded in popularity.
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