Well given you checked in you would delay the flight while QF decide if the are going to offload you or search and page you first. Depending if you checked in at the airport or just online might factor in how long they wait. This would perhaps put an on time flight behind schedule inconveniencing all other pax on the plane. Assuming HLO, offloading wouldnt require a bag search of the hold and would be just paperwork that needed to be completed and reprinting of manifests which would contribute to the further delay of the flight.
I assume since you are a no show and you havent notified them unless you are on a full flex you would likely loose the ticket so couldnt just move flights. Multiple attempts would likely blacklist you for travel. There would likely also be a reconciliation that occurs later to remove the points since you technically didnt fly.
