To anyone pointing to how well the PS2 performed in its later years as evidence of how the PS3 will, you need to be realistic.
To reiterate a post I made a few weeks ago, the PS3 is most certainly not the PS2 in the marketplace. The PS2 was all alone in its dominance. The PS3 will not have that luxury as there will always be the 360 as an alternative, not to mention that the brand new WiiU is not unreasonably more expensive than Sony's 6 year old tech. Of course the PS3 can continue to receive ports for a while because of scalable engines, but again, so can the 360.
Will they still be manufacturing/selling the PS3 in 2016? Possibly, but its relevance (i.e. the longevity that the PS2 enjoyed) will have dwindled off long before then. Price drops and blu-ray playback will certainly help, but around 90-95m tops is actually realistic. I really don't foresee a scenario where it reaches 100m and it certainly won't come close to 115m.