It adds efficiency for military grade targeting but the everyday applications are more novelty than explosive technology. A field technician will have minimal benefit from a heads up targeting display.
I can think of a lot of scenarios where AR would be a great benefit. For example, imagine an electrician running wires through a commercial building and having the wiring path displayed for him. No digging through documentation, measuring, and marking necessary to get the job done. Or imagine fire fighters with AR heads-up displays getting routing information inside building that is smoky and difficult to traverse.
To really make an impact in daily life it has to become usable in public, and the chances of the tech industry getting the tech, the applications and the dorkyness-factor of HMDs solved are pretty slim.
I only see it used in professional contexts for quite some time (e.g. Lockheeds and GEs ideas for airplane maintenance workers seem sensible to me even with relatively high cost attached, if it gets really cheap I could see warehouse workers, building maintenance, ...)