You'd have to also include plain English instructions on how to read the QR code, since the QR code format probably won't be around in the future either.
As for reading the instructions: they could probably still interpret modern English, similar to how professionals today can still interpret English from 500 years ago (with some effort).
As for reading the instructions: they could probably still interpret modern English, similar to how professionals today can still interpret English from 500 years ago (with some effort).