if it launched at the same time as the Wii N6 would probably be slightly above the 360 in power I think Nintendo usually have the most or the second most powerful console of the generation. And the fact it landed a year after the 360 and probably without a HDD means that for about the price of the arcade they could have had a console close to the PS3, probably with a better GPU than the 360 and PS3 and smiler CPU to the 360.
It probably would have gotten better 3rd party support even if it would be mostly ports. And would probably do slightly better than the gamecube as the PS3 would still have been too expensive and lacking in games and Microsoft would still be buying exclusives etc. I think the generation would have been a dead heat with the 360 being in first just and N6 lagging behind the 360 by a smiler but slightly larger margin, of about 4.5-6.5million but all three selling less than they are now. This would mean there was an even greater amount of cross platform titles as all 3 consoles would be so similar. And only exclusives and online would decide the winners and losers.
I don't think motion control would be getting anywhere near the push (if any at all) without the the Wii mote. The game industry as a whole would also be much worse off than it is now without the money from the Wii and the Wii market and the added cost of games spanning 3-4 main platforms rather than 2-3. Or if the worst happened and the N6 totally bombed harder than the Gamecube then the industry would be in a large decline with only MMOs and social games keeping it afloat, even more than it is today. IMO anyway
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