This will only happen if Nintendo releases a new system in 5 years or so - in which case - yes the PS3 would eventually outsell it in 10. Having said that it'd be humbled by the sales of the Wii2 (and likely 720) at the same time.
Currently all 3 (Sony/MS/Nintendo) have all stated they don't want a new console after 5 years. So it's possible this generation will last longer and that gives Sony a remote chance to overtake the Wii - should it suddenly lose popularity and should Sony suddenly gain mainstream appeal - over 10 years.
However, I'm still predicting if that's the case another competitor will toss their hat in the ring by 09 and screw Sony & MS in the process (Nintendo could launch a new console now and still maintain profitability).







