There's not going to be unmanned aircraft in commercial sense in anytime soon.
No insurance company is going to be prepared to take the risk and given that they are still crashing and losing military UAV's I don't see it happening anytime soon.
Aviation unlike trains and trucks cannot just pull over if it all goes pear shaped.
Would also require a complete rewrite of the regs (again
) and a complete rebuild of all Australian airspace as UAV's would be busting CTA steps all the time.