I found that Australians (in terms of politicians) are particularly probe to make these arguments how things can't be done here. The irony is that they go often both ways, either it can't be done because Australia is too big, or because its too small. High speed rail is another example, supposedly it's not feasible because of the low population density, completely ignoring the fact that the density is actually very concentrated, which is ideal for high speed rail. Just a connection Melbourne-Sydney would be perfect, that's (one of?) the busiest air routes in the world. This is all about political will, not feasibility.