15m if it was multi-platform for sure.
I think around 6m-8m lifetime personally.
The majority of sales will come from Europe and Japan so depends a lot on how much they want it. This gen seems strange with predicting sales. Some you think will sell loads bomb and some you think will bomb will sell loads.
The game is taking on massive levels of hype with every delay so the expectations will be high. My expectations will be high.
So it most deffinatly has the potential to ship 8m+. However it is not a mainstream game ala Halo. It is a sports game technically so to people not interested in cars they wont buy it.
So i think 6m to 8m lifetime sounds about right. In Europe it is not really Gran Turismo land anymore, there are now lots of alternatives. So for me it really hangs on how we see the series today.
