In the unlikely event that the government falls, I would expect an election rather than a Labour government. But then again, I'd think that would be the most reasonable thing to do and perhaps not reflective of reality. lol
Does Australia have any kind of Charter or Bill of Rights? Canada was forced to legalize marriage legislatively because the courts were going to rule that banning marriage equality violated the rights of Canadian citizens. Having a court decide it might just let any government off and they can campaign on blaming the courts or whatever instead.
Its tricky to call an election at the moment. We traditionally have half Senate (proportional upper house on 6 year terms with half up every 3 years) at the same time as the Lower House election. Its not possible to have a half Senate election before July next year.
The usual out is double dissolution which dissolves the entire Senate but that can't be held until the end of next year (the Lower House must be in its last 6 months).
The only way out would be a dissolution of the Lower House alone, which will mean an early House election to reysnch with the Senate probably at the end of next year. And if Labor does that they face a Senate that's only a bit more favourable to them than it was to the current Government.
They only need the Greens and NXT or one or the other and a fair number of the Crossbench. Lambie is reliably on their side for economic issues anyway. Hinch is a mixed bag but he's most conservative where the ALP are most timid so that's unlikely to matter. But everyone else is generally hostile with some exceptions for Leyjonhelm who as a Libertarian isn't dreadful on most social issues.
*NXT is fairly easy for the ALP to work with since Xenophon is basically a transactional SA First populist but he'll get his pound of flesh for every victory they claim.
The Greens are more or less free votes because the situations they split with the ALP will generally cause the conservative side to vote with the ALP.
But that's still 12 months of fighting with the Senate which could neuter their reelection chances.