I've been wondering when Google (or someone else) is going to do the same thing for pedestrian routes and locations. There are plenty of highly-trafficked places where GPS is unavailable or not precise enough, and mapping WiFi stations evidently isn't enough to fill the gap. Of course the problem could, and should, be attacked by ground-based radio systems * , but 100% coverage by such systems certainly won't arrive anytime soon, and it wouldn't be like the tech companies to wait for it. You would have to take your phone out to get a location fix ... but that likely won't be the case whenever AR glasses really start to appear in public, and the techcos will also be happy to stick cameras on your clothes and luggage if they and you can get away with it.
* Come on Transport for London, it's high time to show some leadership here.
* Come on Transport for London, it's high time to show some leadership here.