I would (sucky) predict lifetime sales as follow:
Wii- 105 mio
Xbox 360- 104 Mio
PS3- 103 Mio
PSP- 80- 85 Mio (So perhaps rapes GBA wich could easily be considerd as a flopp for a Nintendo Handheld)
DS- 155- 160 Mio
Talking about Next Gen:
WiiU- 65 Mio
3DS- 55 Mio
PSV- 45 Mio
I think i am a bit optimistic with PSV/ PSP!







