Don’t get defensive just yet. We all love our Wiis. But NPD’s monthly market numbers reveal much more than plain shipment numbers for the United States. We decided this month it was time to dive deep into the data and found that U.S. consumers are increasingly ditching the Wii and are adopting rival game consoles, especially Microsoft’s Xbox 360. Nintendo needs a new Wii now, not in 2011 or in 2012. Nintendo has to face reality that the Wii is dying in the U.S.: It peaked in May of this year and has peaked in January of this year and entered a state of decline in May. It will be nearly impossible for Nintendo to return to positive growth again.