The sales of this game will indeed say a lot about the series' appeal. It has pretty much everything going for it as far as it can being a 2D entry. Besides the NES original, no 2D Metroid has ever reached 2 million copies sold. Just breaking that barrier would put it at the third highest selling entry ever, 2D or 3D.
I agree with PAOerfulone for the most part; you really couldn't ask for better circumstances. I for one will be supporting it for sure.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.