Apple has yet to make an equivalent to the Gear VR, and I believe this is holding back VR in it's potentially most mainstream sector; Mobile. Smart phones have a huge install base and are powerful enough for entry level VR experiences.
Nintendo popularized motion control by integrating it fully into their Wii console. Integrated solutions for new technologies are more effective than peripheral attatchments because you get access to the entire market rather than a fraction of it. Imagine Nintendo creating a VR console in 5 years time with 4K resolution, no wires, 150 degrees field of view, lighter and smaller form factor with support for Mario Kart, Zelda, F-Zero and the VR equivalent of Wii Sports.
Sales prediction, PS4: 122 Million, Xbox one: 50 million, Switch: 105 million.
