It's always fun to see old thread being revived, haha.
I think I would have predicted something similar to what people did back then.
40-50 million Xbox 360
80-90 million PS3
120-150 million Wii
So I would have been wrong with everyone, especially the Xbox 360, it did sell more than I would have expected. And overestimated the Wii too.
How it looks now I guess each console has a chance to reach around 90-110 so I'm satisfied with the last generation, very good sales for all. :)
This generation I would predict something similar, but change Wii with PS4, and PS3 with X1 and put Wii U at Xbox 360.