A. PS3 will not last 10 years. Only the 1st place system lasts longer than the start of the next generation.
2. Since they launched the Wii has always had a WW LTD of 2x that of the PS3. With that comes the ability to sell at least 2x that of software.
A + 2 = no way will the PS3's yearly software sales every match that of the Wii.