Despite the promotions and sales plus Black Friday, it's way past time for a permanent price cut for the PS4 Slim and PS4 Pro. You can't justify charging $400 for the PS4 Pro when the PS5 will likely be $500-$600.
The PS5 launch will likely be very messy, as there will be shortages. But Sony probably figured it's a more appealing route than delaying the PS5 into 2021, especially since they want a launch during the holiday season. I'm not planning on getting a PS5 any time soon. I just got a PS4 last year, and there will be shortages for a while.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima