On one hand I don't blame MS for being patient and allowing VR to evolve further, but on the other hand.....Sony is on top of this and competition is what drives the industry so...
I don't blame them for taking their time on it, let Sony do the work and see how many people with that huge installed base are really open to VR. Not only that but I think it's better to wait for the tech to mature a bit, maybe on their next console where they can really have nice visuals without much compromise as well as hopefully a wireless connection between the headset and the console. They got burned with Kinect so I can understand them being gun shy with expensive peripherals.