So how massive the fall of combined HW sales will be for 8th gen?

[Nintentacle]

7th gen
DS - 154.3 million
Wii - 102.3 million
PS3 - 90.1 million
360 - 85.5 million
PSP - 81.3 million
Total: 513.5 million

8th gen
PS4 - 107.3 million
Xbox One - 87.3 million
3DS - 77.8 million
Wii U - 34.2 million
Vita - 18.5 million
Total: 325.1 million