I think if Obeid and Tripodi are killed in an accident (or leave the party, but death looks the better bet - doubt they will get turfed out) then Labor has a slight chance.
You would like to think the Libs would win in a landslide but its still two years away.
Long term oppositions have a habit of snatching defeat from the hands of victory. Fatcat O'farrell or indeed a drovers dog could beat Rees or Robertson but somewhere deep within the liberal party exists an incompetent, bubbling idiot who some people think should be leading the party. He might well be called Peter Debnam although I suspect Peter is not in a crowd of his own.
These kind of boofheads get elected to the leadership when a few people decide that the reason the libs keep losing elections is because they need a strong, robust leader who can really lock horns with the premier, not another namby pamby, then there are those who think that in order to win an election you really need to stand for something and that fatcat keeps his cards to close to his chest. A few others might be bitter that fatcat is leading the party, they wanted the job themselves or wanted someone who will give them a better portfolio to lead the party and finally some will think the election is in the bag and think it the perfect opportunity to take a series of radical reforms into an election, they might not ever have such a good chance again.
A combination of these things sees people like Mark Latham contest elections and the longer fatcat has to wait for the election, the closer he is to a Latham challenge.