“What technology will replace Quick Response (QR) codes in the future?”
I think QR codes have not peaked. The adoption of QR codes was slow because phones did not have a native QR reader in them that was easily accessible. Back when Radio Shack had the CueCat system, they had to give the barcode scanners away because no one had one. I vaguely remember them toying with an audio queue from your TV that could show supplemental content on your PC that went with the program. This was way before Spotify, Alexa, etc. that many take for granted today. With a QR scanner feature being standard with the newer Android OS, I think we could see QR codes take off again.
This take off will be short lived as NFC technology in phones and watches are on the rise and are becoming able to push notifications through apps and HTML5.
Much like QR codes, I know there are issues with NFC. POS card readers need to be updated and the technology needs more standardization. Sometimes, my watch won’t work and my phone will and vice versa. Once this gets more standardized, I can see using NFC in a “bring your own device” model to pushing visual communication strategies in locations. Applications can be movie times when you walk into a theater, virtual “skin” on the dinosaur skeleton exhibit at a museum, sales when walking into a store, or flight information when you walk into an airport. Of course, this is all dependent on people having the NFC turned on and allowing information to be pushed to them.