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

[Soriku]

Slimebeast said:
Wii worst case: 120 million
Wii expected: 160 million

PS3 worst case: 50 million
PS3 expected: 65 million

360 worst case: 50 million
360 expected: 60 million

Agree with this though PS3 and 360 expected may be switched.