Sony has averaged 115 million console sales per gen

[generic-user-1]

Norris2k said:

generic-user-1 said:
it will fall alot in 4 years when the ps5 comes out. the ps4 cant sell 100m+ in 5 years of life.
the hardware is just to weak...

I'm quite sure the PS2 was a lot weaker at its launch than the PS4 is right now. I mean, for a PC player at this time, the PS2 games just looked like shit. I had 8 times as much video memory, with bump map and texture compression.
On the contrary Killzone on PS4 looks quite good, looks quite good compared to PC, and will still look good in 5 years, even if outdated. So I don't think the hardware will be a reason for a quick launch of the PS5.

the ps2 was realy cheap and was a dvd player(when vhs was dieing and nobody had a dvd player). and they never talkd so much about the graphic(because the ps2 was the weakest of the 3 survivers).

and killzone looks okay. good for a console, thats for sure.  i mean some firstparty ps3 titles still look okay if compared to some ps4 3rd party games.