How are you supposed to know when the headset is going to fail though??? I guess in some failure modes you might anticipate it failing, but surely not all… (/s)

But walking with your headset on can be a part of the value proposition, by adding some metadata to what you see. Imagine being shown directions in an unfamiliar place. Or seeing a distant bus and being told that this is the bus you're trying to catch. Once the technology becomes popular people will find a lot of reasons to walk with their headsets on.