Based on fairly common nerd interest in old tech (see: retro gaming, for one thing), I'm pretty sure QR codes will remain a curiosity for the foreseeable future, as they certainly solve a certain use-case/problem
An alien civilization of giant lizard men that once roamed the earth whose dietary habits were superior and everyone should emulate (by buying and reading my book - "The Paleo-Plastic Diet for modern man").
Somewhere a crackpot conspiracy theorist group will be trying to claim that the QR Codes contain messages from this long-lost civilisation…