I cannot see why each side cannot have one appeal each against a serious decision.....there are enough tv cameras now at every game....penalties, sendings-off, balls kicked off the line and serious foul-play off the ball (Gazza's elbow in Harding's face springs to mind)

You get one appeal per game, the ref, linesmen and 4th official have a tv monitor on the touchline....and the decision can only be reversed if there is a genuine reason to overturn it....it works in baseball