It's funny, on a monthly basis compared to 2006-2011 the figures are terrible...in relative terms I don't think GC or Xbox ever had a long run over what Wii and X360 are currently doing. N64 did around 150k a month in its best months in the US, PS1 was more like 250k a month in its best months.
The industry is growing a lot but the historic pattern is that once you hit a certain level...yeah everything just dies really fast.
Will be interesting to see if Wii and PS3 stay above 100k per month in 2012 - I think both will (unless they were split at 160k / 120k this month). February is typically up on January a bit, I know Just Dance 3 and Dance Central 2 are sold out locally presumably on valentines day gift demand, March is five weeks - don't see Wii or PS3 dropping to 20k per week in 2012. Expecting a Wii price cut once 3DS hardware is profitable again to differentiate Wii as a legacy platform from Wii U.
I guess that's the other thing - next generation console launches typically lower holiday growth for older systems. I actually don't expect Wii / X360 / PS3 to be down 30-50% for most of the year, probably more like 15-35% in most months, but Wii will be down a lot in November and some in December, and the same goes for X360 and PS3 - and the only reason Dec won't be down massively is because it was a shit month in 2011.
It will also depend on how Wii U launches, if its hot and priced right with a strong stream of big games it could sell very well, better than Wii did initially (Wii did about 1m in 2006).
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