Not saying there’s an explosive growth, but use is growing all the same.
Structural Graphics – Death of QR Codes Is Greatly Exaggerated
“Among the most common uses for QR Codes are accessing coupons, downloading mobile apps, and accessing product information.”
There’s yet no really practical substitute for print, except possibly image recognition, that so far hasn’t had much success. Possibly because there are many competing solutions. A QR code is what it is, specified 20 years ago, that doesn’t require any proprietary means for use. Pretty much any barcode app will do.