Going by the sales numbers in the OP...
PS3's 1st year was 17.9% of the PS2's 1st year.
PS3's 2nd year was 43.8% of the PS2's 2nd year.
PS3's 3rd year was 42.9% of the PS2's 3rd year.
PS3's 4th year was 63.2% of the PS2's 4th year.
Yet some people expect that after 10 years, PS3 will have sold 71.4% as much as the PS2?
It would need to start selling at PS2 levels or DS levels for a while to catch up to where you guys think it can go. It's just not going to happen.