It's worth noting this isn't a proper actual forecast, but a "what-if", where Iwata has applied the current percent of Japan which owns a DS and applied it to the total population of Japan+US+Europe.
If he were to do the same calculation a year from now it would be even higher, since non-zero DS sales will make the percentage of the Japanese population which has a DS higher.
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If he were to do the same calculation a year from now it would be even higher, since non-zero DS sales will make the percentage of the Japanese population which has a DS higher.