Well that's a rather snarky comment with no basis in reality.
PS1 sold around 110m consoles. PS2 sold around 120m. Dunno if that's necessarily the case avaya. I'd argue that it held onto its core market and slightly added on to the last generation's totals.
I don't mean to be snarky about it! Sorry! but any relaitonship with such a low sample size (I'm not talking about years since that is actually irrelevant in my opinion, the event in question is a generation switch)) can produce spurious results. So although the conlcusions drawn from the observations can be logical, it doesn't mean to say they are accurate.
I think breakdowns per region are more useful than anything else. The only reason PS1 reahced >100mn was because Sony opened up EMEA/PAL, IIRC it is still the highest growing market. If you look at NTSC, PS1 didn't really do anything that wasn't seen before. Same with PS2, it's extreme marketshare dominance is built on EMEA/PAL. I'll try and dig up some numbers on this...
Moreover PS2 has not stopped selling....while PS1 shipments only ceased a year or two ago.
That's what I refer to as non-cores. Those people who in the prior paradigm would not consider a certain product who are now buying.
In the west CD based players were already on the decline with the advent of MP3, the iPod is simply the new Walkman but with superior brand equity. It is important to add that listening to music has no social stigma attached to it!
I'll say again, I don't believe Wii is expanding the market in any region except Japan, there is simply no hard evidence to the contrary at the moment.