Apple has made special efforts to distance itself from PC gaming, doesn't court publishers/devs, and is otherwise a troublesome platform for gaming entirely. Why would they get into gaming peripherals? What version of OpenGL does OSX ship with now anyway? What milquetoast videocard is shipping with the current gen of devices? Things like the Rift require something on the level, on a MINIMUM of the Nvidia 370, which is a near $400 card that eats up watts like no one's business.
The few OSX gamers I know just gave up and run parallels or bootcamp.
VR could be the next paradigm shift, but it might not be.
If it is then the transformation could arguably be bigger than mobile was and the hardware/software companies can't ignore it. Games may just be the first obvious application.
While autonomous cars have been more obviously coming since 2012, VR is more uncertain. I'd imagine Apple is doing some work here though or at least watching it closely.
The few OSX gamers I know just gave up and run parallels or bootcamp.