This is pointless, if GTA 5 was launched only on xbox 360, then everyone would just purchase a 360, xbox one or series S/X to play it, it would have sold almost the same. If it had launched only on ps4, sales for ps4 would have been way more, most people would just get a ps4 for it. The game would sell a lot no matter what.
With that said, Mario kart 8 would sell way more if it was on other platforms, so I think it would have sold at least 100 million if it was on all platforms.







