hmm 162 million last gen consoles back when PS2 was at 116 million...
Since SONY has shipped 130 million and expects another 10 million this year i think that assuming last gen to end up around 185 million - 190 million is reasonable.
I think combined PS360Wii will easily outsell last gen moving 220 - 240 million consoles.
My personal prediction is:
Wii 120 million - 130million.
PS3 55 million - 60 million
360 45 million - 50 million
From my prediction Wii would have over 50% marketshare but wouldn't dominate like PS2 did and will proberly fail to pass PS2 in sales... PS3 and 360 however will greatly exceed Xbox and GC. Which is preety obvious ( current predictions have 360 around Xbox sales and PS3 close to GC sales by the end of this year !... )