This is new.
Here's a tip:
No one cares why "people" no longer play games on a PC. "People" still playing games on a PC are way more interesting.
Also, guess what? The fact that publishers are starting to stagger console and PC game releases so that the PC version comes out weeks or sometimes months later would indicate to me that, while maybe "people" aren't buying PC games, "people" are still playing PC games, enough of them to warrant publishers spending millions on trying to prevent piracy of said PC games in which "people" would just download the PC version of the game instead of buying the console version.
Also, there are quite a few people playing MMOs, which are on PCs.
So yeah, people are still playing PC games, contrary to popular belief.