In the specific case of Oculus, yes, you're right. The SteamVR technology and Oculus technology were largely developed in parallel, so it's not surprising that

In the specific case of Oculus, yes, you're right. The SteamVR technology and Oculus technology were largely developed in parallel, so it's not surprising that they're interoperable with some software hacks. That doesn't mean that others aren't working on different technology. I think the only real threat to Facebook in the VR space is Sony. Valve really isn't pushing their platform that hard, and the other players just don't matter. I really hope they don't just give up on PC VR because their "if you build it, they will come" approach isn't working out. Like I said, VR itself isn't under threat. It's mainly PC VR that's suffering.