Umpires do have a significant influence. Created more crowd fights than I have seen for many years, final booing proves respect is earned not forced, impact on scoreboard profound. Must be overhauled and a professional body established.
A professional body at arms length from the AFL too. Should cover umpires at all levels and be run separately. The AFL make the rules, but the adjudication should be run by an organisation that can train the umpires without undue interference from head office. Bit like the ways courts are separate from legislators.
DS