But we're not talking about 100 million yet. We're talking about 6-9 million, so it is a big deal.
The BIG problem is your MAIN YEAR of FIRST year life of PS2 is nowhere near the size of the MAIN YEAR of FIRST year life of PS3.
2001 vs 2008 is interesting, but it's in no way a valid comparison of second years. Unfortunately due to the staggered launches it's impossible to fairly use calendar years.