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The things in favour of the NRL and the AFL is that they are domestic competitions, both are thinking of re-starting in May/June with the completion being played in one location once state based 14 day isolation periods are met.
GRR is an international competition and with International travel being non-existent at the moment and also for the foreseeable future they are definitely in a different basket. You do realise that Scott Morrison has said that lockdowns in Australia are most likely to continue until September? The same with the borders being closed? How do you plan an international completion with so much uncertainty? They could try a plan similar to the NRL or the AFL and play it all in one location, perhaps they've put that to the players and they weren't fans of it?
Super Rugby won't be starting anytime soon and by soon I mean months.
The ICC T20 World Cup is currently still scheduled for October but if the borders to the country are still closed closer to the date I guarantee you that it will very much be postponed or canceled because the next T20 World Cup is only 12 months after this years event. BCCI won't give up hosting a World Cup just to accomodate us.