Big difference with the preferential system isn't there?
Surely polling for a first past the post system would have less uncertainty yet there were big surprises in the 2015 general election even with aggregated polling methods like those popularised by nate silver.
The point I'm making is that confidence in political polling took a hit after the 2015 general election which means that Abbott may be on more stable ground than six months ago despite the seemingly entrenched trends against the party.