I could see how they could be popular, I just know that here in the US, using QR reader apps is not popular
I mean... I am the biggest QR code hater in the world.. ok, not literally.. but yeah, I have NEVER understood where using a QR code is ever more convenient than the other way of accessing it. Like, I don't care about your shitty marketing. No I don't want to go through the hassle of loading up an app, to scan a code, for you to sell me something..
with that being said, moving it over to smart recognition in the camera app, which is a swipe away from my lock screen, and transitioning QR codes from marketing to something useful... shit, now THAT I can get on board with.
my hope (uggh. hope..) is that now that QR codes will be potentially ubiquitous with 500M plus users.. that places will start using them for more than just marketing. let me scan a QR code on a bus stop sign to be instantly taken to that bus lines' schedule. that sort of thing.