I'm not fussed on whether players sing the anthem or not.
They are there to play the game and I believe they can honour the national anthem in any way that doesn't disrepect it.
We don't need to go back to the Alan Jones days where they had singing lessons. And in addition TV broadcasters take note - never turn the microphone on the camera that passes down the line of players - as I said before, they are there to play the game and this isn't Australian Idol...