I have a plan. Firing may be a little heavy handed. However, when a ref makes a blunder call because they don't know the rules like the 4th and 1 play, they get suspended. To come off of suspension they have to pass a 100 question rules exam.
Best thing to help refereeing would be to re write the record book making all the rules concise. A player catches a ball once he catches it and takes 2 steps. Something you can look at and count. Get rid of vague stuff like football move etc. However, I think this is just what the NFL wants, a way to queer the game when they need/want to.