by this site 360 ratio is now 6:1 in America and about 3.5:1 in Jp, [though Jp numbers will make little difference added to America], i reckon Eu numbers might be enough to pull it down to 5 - 5.5
thats partly why i said 360 will be highest.... i mean by the end of 2002 ps2 in Japan had an attach ratio of about 4, and it's currently about 5.5, i know thats just Jp and it wont be the same WW but the ratio only goes up slowly once the machine has been introduced properly... so for 360 ratio to double 5 years from now is damn good.
other examples; [Jp only] 2002 x-box ratio was about 2... in 2005 it was still under 3.
2002 GC was 3.5 ... now it's still under 5.5
again that's only Japan, and home console ratios seem to be smaller but in WW terms you shouldn't expect even 360 to end much over 10 even with optimism.
