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Nintendogamer said:

I believe Wii will top 90M around August to September this year,  but last year NSMBWii wasn't the main cause of Wii's boost but it helped, the usually holiday and price cut were more responsible.

It was probably NSMBWii. The Price cut did very little. Sales went up in the shoft term. Also, the system sold 4 million in a month. That is not usually, something price cuts and seasons would not explain.