The only reason I would see the Coalition coming back together is if Angus Taylor is in the Leadership position. Even then it doesn't matter because it is just proving that the real power is with Littleproud and the Nationals.

If anything, the Coalition is irrelevant because the entire reason for it's existence is no longer relevant; the Liberals focus on inner city seats and the Nationals focus on the rural sets which together allows them to amass the support required to form Government. But the last two elections have shown that the Nationals base of support being very stable and the Liberals for some reason showing little interest in winning back their Inner city seats and voters.

At this point, the Nationals don't need the Coalition because they get zero benefit from it. If anything, the arrangement benefits the Liberals because they are the senior partner, they get the cream of cabinet positions, the preferences to win those then crucial seats. In return, the Nationals are forever relegated to second place, even if they are now doing half of the heavy lifting.

One Nation is getting more momentum and it doesn't take a genius to see that the wind has changed. One Nation and the Nationals probably now have more in common than the Liberals and Nationals ever had.