Concur. With the latest advances in laser projection (see: Microvision's pico projector), it's only a matter of time before we see low-cost see-through HUD glasses. Add a small cam on the bridge for image recognition, and you've got pretty much Terminator vision.

Let me expand on that a little bit, though, so I'm not misunderstood: use the cam for image recognition, sure. But instead of piping the cam image to the projector, simply use it to map the augmented reality elements (visual tags like addresses, direction-path, and so forth) directly to the projector so they line up correctly with what you actually see through the lens. Add a digital zoom pip for when you want some far-off detail up close, I suppose...