The idea of the FBT choker is definitely interesting and seemingly feasible. But will it actually take hold? The aesthetic of it being a choker might sit OK with degenerates, but for other people, wearing something that looks like a choker, especially if it's made by Facebook, is like telling them that they're literally a slave to corporate. In addition, by the time we get the technology to do an FBT choker, we may already have decent camera-based FBT, or cheap and light tracking pucks that are tracked by the headset and that work without direct line of sight to the headset, possibly using a future form of ultrasonic or magnetic tracking.