I'd argue the Vita is different from Vive and Oculus as being at least relatively open.Yeah I really prefer PC VR for that reason too.
PSVR being a part of a closed platform can certainly have support dry up. PC is less vulnerable to that. As long as someone thinks the experience is worth it, it'll trickle in.
People have put in unofficial support into games like Minecraft and Skyrim.
Honestly that's a big reason why I have been thinking about getting a PC headset over PSVR.
Plus VR makes sims games even more amazing, and I love sim games on PC.
If PSVR supports PC then I'll be super happy. I'd still buy almost all VR games on PS4, but on PC I could run the unofficial ones.