Playstation is not going to go away just because Sony is going to release games day 1 on PC.
However, assuming Sony did fucked up the Playstation ecosystem and Playstation is no longer exist, I can 100% assure you that you wont be seeing games like GOW/Spiderman on PC.
Because PC sales alone wont be enough to fund the AAA games under Sony. Majority of the fundings were coming from the Playstation ecosystem and PS Plus.