I would argue that the new rule changes have slowed the decline of lower scoring, so if you go back to the old rules the decline would speed up. Of course slowing the decline of the lower scores isn't what the new rules were brought in for, so on that level they have not worked.
Also I never understood the lower interchange cap idea. All that would do is push the slower players out of the game and create a game where endurance athletes are more important than players with skill.
Think of a team of 10 running a marathon verses a lone competitor with endurance. Why a 4 x 100 relay is quicker than a gold medal winning 400 metre swim.
Less players not being interchanged across the 100 minutes (sic) will encourage man & man contests rather than zoned defences that dominate coaches thinking, see Malthouse coached sides since day one of the AFL.