Probably don't work well in VR. They are tuned for controllers which aren't immersive and people seemed to get nauseated by the disassociation. You'd need a way to control the game with its pace, or more likely a bespoke solution that's tuned for VR, slower, more realistic, with a different interface. And why bother making that for an maximum audience of a few million when there's hundreds of millions of potential buyers for your normal game?
Very true about the pace indeed. Bethesda is bringing Doom VFR which is also a FPS game, although I guess that by its nature is not much of a free roaming experience, compared to those games (less outdoor areas, more like an on rails experience with the illusion of freedom). Still, they could try to have "something" to play with it, just like Rockstar did with Arkham VR. But yes, I guess it may not make sense financially.
I just got so much into my PSVR that I really would hate for it to fade away