Idk about a billion copies, but can only base off of historical releases for the studio. GTA 5 made $1 billion after 3 days and in 2018, Red Dead Redemption 2 made three quarters of a billion in the same time frame. GTA has only continued to pour in money due to GTA Online. So even more people are familiar with the franchise than there were when GTA 5 released.
Then there's the inevitable PC release. No doubt Rockstar will milk GTA 6 for as much as they humanly can.
One thing's for sure, it's going to be the biggest entertainment launch in history. Not just gaming.

You called down the thunder, now reap the whirlwind







