What is the lowest realistic expectation for lifetime sales of Wii,PS3,360?

[Galaki]

I am guessing that by the end of this gen. A total of 300M units would be sold. Yes, I believe the gaming industry is in bloom :)

Wii: 200m
360: 40m
PS3: 60m

I think ps3 will overtake 360 in a year or 2.