I believe Sony released the Pro because they normally saw people transitioning to the PC about midway into the generation, so this was an effort to keep more players on Playstation. The only way to measure this would be to compare PS4 software sales to PS2 software sales. Not sure if it's helping PS4 software sales or not, but I'm sure Sony is tracking this carefully.
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