Gidday mate! Yeah no surprises there PAF.
South is the
only feasible way another runway could go, except don't forget about the railway line too. However given the rate of expansion of the northwestern suburbs, well, I'd be surprised it ever happens! It would require planning and land aquisition to start
now. The idea being touted by some of a 10/28 runway extension is poppycock, IMHO.
The fog will be the major weather issue. I cannot even begin to count the number of times I've looked out the front window from my perch here in the mountains and seen the base shrouded in fog, then driven into SYD where it has been fine. And who could forget the good ol' days when we used to do local, and sit around for hours playing uckers waiting it to lift?