Prediction: PS4 - 130 million Hardware, 1.6 billion Software lifetime

[Mnementh]

PS4 should be peaking this year. So 100M should be easy, beyond that can be more difficult. It depends strongly on how fast the PS5 gets adopted. If it is slow like with PS3, the previous console could sell decently for years. If PS5 starts strong, then PS4 will decline fast.