DS: 180m
Wii: 120m
PSP: 72m
360: 60m (it is going to die after this year IMO)
PS3: 100m at least (it is now doing over 10m per yer, so yes it is possible, remember PS2 is over 100m, so take that into account)
I am rubbish at predictions, so I will probably be wrong...
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1