I don't think so. 4 million it´s the minimum in three years.
Not sure what you're saying here, do you mean it'll sell another 4 million over the next three years?
That's certainly possible, it could top 15 million lifetime and move into the next poll bracket, it will depend how it's long term legs are.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023. (And over 130 million lifetime)