Well it seems we might have a twilight grand final in 2017
From a personal viewpoint it does not worry me but why not go the full hog and make it a 7pm start
https://www.theguardian.com/sport/2017/mar/16/broad-acceptance-from-afl-fans-over-twilight-grand-final-proposal
"A twilight AFL grand final seems increasingly certain for 2017, with an announcement to be made within days of next weekend’s opening round.
AFL chief executive Gillon McLachlan said there was now “broad acceptance” from fans for the move, with several AFL captains including Scott Pendlebury, Nat Fyfe and Joel Selwood also offering support."