If Gran Turismo released every 2 years how much would each sell?

[torok]

JayWood2010 said:

So I have been thinking about Gran Turismo and the numbers it has pulled off this generation.  Gran Turismo released in November of 2010 which means it has been on the market for roughly 2 years and a half.  With that said it has sold 8.83 million which comes out to being 294k a month on average with this number decreasing due to the decline of old age, nothing more.  None the less it is still selling well for an old game.  

With that said Gran Turismo 5 has shipped over 9 million copies and has a good chance of reaching 10m over its life if they bundle it (Please do not bring up bundles as if they are bad.  All of the big 3 bundle).  However if they do not bundle it it may never reach 10m.  Now if Gran Turismo 6 or Prologue gets released within 2 years (Already passed the 2 year mark) of Gran Turismo how well do you think each Gran Turismo would sell in the future?

I think that it would reach 10 million easily without bundles. Looking at the legs in GT4, it could go pretty far. With heavy bundling, I believe that even 12 or 13 million would be possible (despite that, I think we will only see some moderate bundling).