PS2 slim released in September 2004 if i'm not mistaken.
Sales of PS2 at that time.
52 million.
current sales.
132 million
total sales of ps2 slim.
80 million
percentage: 60%.
So PS3's current total, 23 million, would give a lifetime total of 57.5 million.
PS3 sales compared to PS2 sales at same point in life.
Ps2: 37 million
PS3: 23 million
% of sales = 62%
if it maintains this for a 10 year life like ps2.
PS3 end total: 81.84 million.