Personaly, I would rather pay an extra few percent on my ticket price and know that airlines had to carry more fuel than present rules allow.
And who would that be then? Looks like the Qantas flight that followed them had even less and had it not been for them giving way to the QF they wouldn't have been in the situation?
I'm afraid that in the current climate of competition and cut throat margins no airlines are going to be carrying extra fuel if it doesn't appear necessary from the forecast.
Looks like you're going to have to travel by train in the future.