PHO's usually have a sunset of 90 days unless they are repealed or re-issued. The minister is the sole signatory upon the advice of the CHO but sooner or later we'll have to revert back to usual practice, the PHO's have to stop sometime.
My feeling is that they may well be morphed into State legislation with PHO's issued ad hoc if they want to restrict certain areas, or businesses! Future localised restrictions have already been flagged by GB this morning. Now that morning press briefings will be held by Health officials it will allow them to beaver on with other business (Covid legislation). Expect to see something in the new year.
I'm afraid we'll be forever stuck with QR check in's, the data it produces and its usefulness is far to valuable to give up.