It should be used for clear cut cases like this one.I have to say, don't agree with a send off rule. Would maybe entertain the idea of a sin bin for maybe 15 minutes or a quarter, but send off, no thanks, I can just imagine how badly the AFL would f*ck it up.
DS
Soccer has had red cards for ever and a player can be sent off for 2 slightly mis-timed tackles. Plus you have to play out the remainder of the game with one less.
Unlike soccer, you'll be able to replace the player with someone off the bench.