It's interesting looking at the numbers excluding the Nov-Dec launches of Xbox One and PS4 -
They're both trending well below PS2 / WIi, in 2014, including years we don't think of as strong for either - PS2 in 2001 - good year, but not spectacular or historic, Wii in 2007, 2010, 2011 - good years - not historic. I
PS2 in H1 07 - 1.53m
PS2 in H1 06 - 1.69m
PS2 in H1 05 - 2.48m
PS2 in H1 04 - 1.85m
PS2 in H1 03 - 2.31m
PS2 in H1 01 - 1.98m
Those were all good but not huge years - roughly 4m to 6m years.
Wii in H1 11 - 1.74m
Wii in H1 07 - 2.11m
The Wii years I've cited are similar too - and also imply 4-6m.
X360 also did 2.4m in H1 2011 - when it sold >7m for the year. So to me, overall the numbers imply about a 5m year for PS4 - strong - but not anywhere near what the launch year suggested was possible.
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