I voted 80-89.9m, but I might be too generous even with that prediction. While some people will own multiple systems, the single system owners are going to mostly go to the Switch. Those who are extremely price sensitive will probably go to some form of Gamepass, as will most Bethesda fans. I think Sony's going to have a real hard time this generation.
Bonus: VR will probably do marginally better on PS5, but I don't expect it to ever go fully mainstream.
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