actually somebody did. 

http://gamrconnect.vgchartz.com/post.php?id=6216279

and

Before the link to the 6 Million number was posted, which he acknowleged. Also said it would be lucky to break 6 Million, not that it outright wouldnt. Also went on to predict 8 to 8.5 Million.

8-9

8.9 billion

I voted 8.5. It depends a lot upon marketing, and IMO I don't see too many buy the game again, although being on a forum full of Sony fans makes it seem otherwise. Of cource, anything can happen, and I wouldn't be surprised if it reached another million above that. Still, I hold on to 8.5.

10 million seems pretty doable if we include digital and the eventual last of us: remastered+last of us 2 value bundles that'll show up much later in the gen.

PS3 sales will probably drop off a cliff though.

Nvm. Fusion and Banana already pointed out Kowen.

TLOU has massive legs and its still retailing for $59.99 new. Once it drops to $20 it'll sell another million. 

7.5M on PS3 lifetime.

2-3M on PS4 lifetime. 

So about 10 mill. 

a lot. like 11 million

I say 7 mil on ps3
and about 1 to 1.5 mil on ps4