Once again depends if it gets a dedicated PS5 version. In this case that seems pretty likely since they're going to port the game to other systems next year anyways, among which will probably be a Series X port. With that in mind I still think it'll hit at least 7 mil on PS4.
Bonus: 2025. Maybe late 2024 at the absolute earliest.
- Switch - 27m
- PS5 - 15.5m
- Xbox Series - 10m