I think it will sell like SM Galaxy. According to this site, Galaxy released Nov 3, 2007. By first week of January, it sold approx. 4.5 million. That is what I think Odyssey will sell. Approx. 4.5 million.
Odyssey, as a game, is not terribly different from other 3D Mario games. I expect it to sell like other 3D Mario games.
curl-6 bet me that PS5 + X|S sales would reach 56m before year end 2023 and he was right.
My Bet With curl-6
My Threads:
Master Thread, Game of the Year/Decade
Switch Will Be #1 All Time
Zelda Will Outsell Mario (Achieved)
How Much Will MH Rise sell?
My Bet With Metallox