I voted not sure because this is such a tough question to answer. First of all the PS2 is a "moving target". Secondly the Wii may start to get to saturation point at about 100m. The PS2 may have sold more due to some people buying multiple consoles to replace breakdowns etc. Also there's the fact that the market is so different now. Particularly with the Wii's new market. Then there is the factor of the developing markets. If the Wii can really "tap into" the potentially huge markets of Russia, China and India in the future then i say it can do it.
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In my opinion the N64 was not just the best console of the 5th gen but, to this day the best console ever created!