Pachter expects it to sell 3 to 4 million.
"Their games are, they appeal to a certain type of gamer, they are very much a more niche style of gameplay, they’re single player only, and we’re in this era now where the single player gamer is on one side, and the multiplayer gamer is on the other."
““I’m actually looking forward to
Detroit, it looks like it will be a different kind of game. I think Quantic Dream makes very dark, very thoughtful stories, but if you just want escapism, their games won’t be the best ones to play. So I’m a huge fan, and I think it will do super well, but I don’t think it’s doing 15 million units, or outselling
God of War. 3-4 million units sold, which is good for a PS4 exclusive.”
The prediction is a more or less reasonable one. It puts it over
Beyond: Two Souls on the PS3, albeit still under
Heavy Rain, which ended up selling over 5 million copies across the PS3 and PS4 versions.
https://gamingbolt.com/detroit-become-human-will-sell-around-3-4-million-copies-says-michael-pachter