Sony itself has just revealed that Uncharted 4 will be coming to PC (and will most likely be the next Playstation-exclusive game we receive). The company revealed this during its IR Day 2021 Game & Network Services Segment.
As we can see, on Page 26, Sony clearly states that Uncharted 4: A Thief’s End will be coming to PC.
Sony also stated that its ROI (Return of Investment) regarding its PC initiative is 250% (as of the end of March 2021). This basically means that it was profitable (for the publisher) porting Horizon Zero Dawn. Additionally, Days Gone appears to have sold well during its PC launch.
Lastly, Sony plans to expand its PC releases in order to target new geographies.
I went ahead and captured an image of that slide in case Sony deletes the entire PDF.