This is a genuine question - what happens to a referee who makes a glaring and obvious error? What happens if it happens frequently? Is there a sanction?
Which comes back to the accountability issues. If there's no process to deal with referees who are making the wrong calls, the standard will never rise.
It's like a player who has no competition for their position: will they ever really push on? People make mistakes, it's natural, but repeatedly is not acceptable.
Until there's accountability, refereeing in this country will not improve as the closed shop (the PGMOL runs by ex-referees) will maintain the status quo.