Is a good idea try to answer correctly the topic.
My personal experience is that after 10 years the single seedling (by me sown, of 2 by me conserved) is sprouting now the first fruits, but dropped.
Another seedling plant 15 years old has never fruited.
A my friend in a very more hot site declared that after three years the seedling fruited.
About possibility of have production of edible fruits:
There is 50% of have male pollenizer fig (caprifig=billigoat), NOT edible fruits.
50% of have female plant, edible fruits.
If the plant is really a seedling this means that around 2 kilometres the plant that produced the fruit (with seeds), there is a male plant colonized by the insect that pollenize.
As I know around Adelaide the insect exists in colonized male plants
The condition is not stabile but his presence can be diffused and extended year after year also away from Adelaide (*).
If the male plant that pollenized is "permanent", so meaning has permanent fruits, (that stay also if NOT colonized by the insect) this genetical condition will be transmitted by seeds to daughter female plant, having so a "permanent" edible fig tree, said commonly "parthenocarpic", that ripens fruits also if NOT pollenized, the American define this a "common fig".
If said male plant is "caducous" (fruits if NOT colonized by the insect drops), the produced seeds conserve this condition and daughter female plants produce fruits ONLY if there is around two km a colonized male (billygoat) plant.
The condition of transmission of permanent or caducous is so genetically male-determined in offspring, males and females.
Every seedling is at all a new variety (male or female), you have to attribute a name.
The quality of the new variety is unknown and depends from parernts (of course....).
Normally ther is no matter for create new varieties, without particular argument, but Australia is "out topic" because is quite impossible to introduce new varieties from external, for so "new" inside is precious.
(*) I will be happy to receive notices from Australia about speading of Blastophaga psenes, (the pollenizer insect) my attempt demonstrate that type of botanical informations are quite secluted there .....
I'm allowable to give clarifications
Regards,
Blastophaga, (Sergio), Italy