Silent_Buddha
Legend
Everyone can probably agree that the 4.2M is a great number, but the PS2 example is just horrible. These "two years" of it having 10.6M in reality only contain about 13 months of Japan AND only 5 months in NA and 4 months in Europe. The numbers Nathansfortune gave for PS2 are way more proper and accurate view of the situation, they still only contain a very limited non Japan first year for the console. Your two year period starts 20 months before the console was released in Europe.
It doesn't matter if it was only in Japan during those first few months.
That was still the entire worldwide supply of PS2s. That is completely different from worldwide demand. Had they launched PS2 in NA + Japan + EU at the time, they still would have sold the same number of PS2s because of manufacturing limitations (like the PS4/Xbox One) or due to localization limitations (like the Xbox One).
Whatever the case, in its first full year of sales, the PS2 is likely to fall far short of the first full year of PS4 sales. That does not, however, mean that lifetime PS4 sales will exceed lifetime PS2 sales. Although there's a good chance that it might depending on how long this generation lasts and whether it soundly beats the Xbox One in WW sales. 4.2 million versus 3 million isn't soundly beating yet. But if at the end of the first full year it's 16 million versus 8 million, or something more lopsided, I'd say it was well on its way to soundly beating the competition.
Regards,
SB