Eh, it's more of a case of the era of 3rd party exclusives dying out. Sure, Sony has lost exclusives like Nioh, Ni No Kuni, Yakuza, and Disgaea 5, but on the flip side a lot of PC only games have come to the PS4. Games like Subnautica, Divinity 2, Pillars of Eternity, and Shadow Tactics.
For Gen 9 there are only two types of games that will remain platform exclusives. They are...
1. Games that Sony/Nintendo owns the exclusive rights to will remain PS/Switch exclusives.
2. Games that can only be played with keyboard and mouse, will remain PC exclusives.
Oh, and Persona 5 will come to Switch before it comes to PC. Every Persona since 3 has had a portable version. P5 will be no different.