Oh, they won't abandon the PS3/360 crowd, they just wont make many games that use motion controls on those consoles, no the big issue is next gen, in the next gen, with the inputs wildly different, developers won't be able to port between the three consoles easily and therefore won't, due to costs, this will result in gaming being very fractured, this will benefit the next Nintendo console greatly, first Nintnedo's next console will be cheaper than the 720 or PS4 to dev for, in addition thanks to nintendo's in house development, will have stronger system driving games than its competitors. Wii's successor will benefit greatly from this new landscape that the Wii is creating.
Predictions:Sales of Wii Fit will surpass the combined sales of the Grand Theft Auto franchiseLifetime sales of Wii will surpass the combined sales of the entire Playstation family of consoles by 12/31/2015 Wii hardware sales will surpass the total hardware sales of the PS2 by 12/31/2010 Wii will have 50% marketshare or more by the end of 2008 (I was wrong!! It was a little over 48% only)Wii will surpass 45 Million in lifetime sales by the end of 2008 (I was wrong!! Nintendo Financials showed it fell slightly short of 45 million shipped by end of 2008)Wii will surpass 80 Million in lifetime sales by the end of 2009 (I was wrong!! Wii didn't even get to 70 Million)