The Wii+PS3 combined sold over 4 million units in 2006. Those would be very impressive sales for a single console alone to manage this year -- basically selling over a million more units than the Wii in its launch Holiday at a $150 higher price.
The DS sold over 8.7 million units in the final quarter of 2006... Pokémon Diamond and Pearl were not released outside of Japan until 2007. The 2DS matches the DS Lite price of $130 in America.
It would not be unexpected for the 3DS to exceed 8 million sales in the final quarter of this year. It would not be unexpected for the PS4 to sell under 4 million, either. You should expect the 2DS to be the best-selling 3DS model because it has the lowest price and has that "new" factor.
This is possible.