Heh, I know old prediction threads like this are funny, but the OP makes the same basic mistake that I still see a lot of people making today. Namely, he thinks generation 8 will determine generation 9. Nope. Nothing could be further from the truth.
Every new set of consoles is a huge reset in the market place. Did the best selling console of all time, the PS2, lead to the PS3's success? Nope. Did the PS3's massive financial failure hinder the PS4? Nope. Did the Gamecube hinder the Wii? Nope. Did the Wii help the Wii U? Nope.
Every generation is different. Every time a console launches it's a huge reset in the marketplace. The only thing we know for sure about generation 9 is that the Switch is already successful. That already puts PS5 and Scarlett at a disadvantage. I am sure they would rather be competing against another Wii U. Instead it is more like they are competing against another Wii.
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