You wouldn't have more than limited head tracking (or live motion without turning off tracking and turning it into a virtual window), but being able to have presence from 10' above the QB in American football for each snap?
$$$s where you start counting the zeros instead of the digit in front.
Oh, and every high security facility in the world would love these as they're capable of mapping out 3D positioning, enabling very precise face detection, etc...
And imagine live concerts sent to be displayed on VR headsets!
Also, in many cases you can likely use 4-6 in a grid to capture the entire scene.
So limit the applicable use cases to where that isn't going to happen.
The excitement about this is that it makes that no longer a concern for sufficiently small values of head motion. Read: the motion that occurs when the best of your body is not moving.
Courtside? 50 yard line? Right by the mid tower in Dota2?
And I'd imagine a fair amount of the current height is not due to interference, but rather getting the best perspective.
What is going to be cool is stuff like standing right on or slightly above the field in the middle of a sports event, or right on stage at a concert next to Mick Jagger and being able to move around a bit.
Unfortunately there will need to be a globe roughly the size of the range of motion somewhere to capture the light rays... at least for now until future physics are invented.