PS4 Pro will likely get discontinued in the next few months. It might get an official price cut down to $250-$300 to get rid of existing stock. PS4 Slim will either stay the main PS4 and be priced around $200 or we might get a PS4 Super Slim (All-Digital) for that price.
But I agree. Considering that Sony announced several PS5 first-party titles are going to be on PS4, might as well drop the price. Demand for PS4 isn't high anymore, but I think demand would be higher if it was $200, and that would be a great option to market with new Sony titles.
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