The production costs of creating 3D content that is actually making use of the extra dimension will be cost prohibitive for lots of types of content where 2d is used today. I really wouldn't care much for lots of YouTube content I watch being provided in 3d, half of it I already just listen to. As an example, look at how much more detail needs to be added to a room in a VR game versus a standard 3D game - since you have more freedom to poke around and look at things from more angles, stick your head in things, the expected level of detail is much higher. Just adding VR to existing games can make for a good experience, but VR native content will be more expensive to produce.