It does suck that FB bought OR. In principle I have nothing against buying a VR headset from them, same as buying a mouse from "evil" Microsoft, as long as it's just hardware. Problem is: FB, unlike MS, is a company founded on a business model of gathering and whoring out our personal data, and serving us ads. Not a big fan of that. FB may be trying to diversify their business a bit with projects like the OR, which is good, but they may also see it as something to augment their existing business model. In general I'm not happy to see these exiting new startups being snapped up by the new molochs: FB buying OR, Google buying Nest, etc.
There are a number of other groups working on VR headsets, but as far as I can tell they range from DIY efforts to prototypes that are still a long way from appearing on shelves in shops. Even Valve seems to be struggling, with their VR team bleeding talent to OR's team. With that said, I do expect some consumer and computer electronics manufacturers to jump on the bandwagon once OR proves that there is a viable market for VR headsets.