If they can we are in deep trouble.
Up to date the Greens have been able to travel under the radar of serious examination of the consequenes of their policies. Now they are anticipated to hold a clear-cut balance of power in the new Senate, the question is, what sort of legislation can get through unless it has bipartisan support from Lab and Lib.
Assume for the moment that the ALP get the first crack at government, then consider the kind of provisions that the Greens will demand to pass legislation in the Senate. Wait until Joe and Jane Citizen find out the costs and other downsides of Green thinking. It is well documented that a lot of people are prepared to talk green but keep their hands firmly in their pockets (or out of them) when it comes to parting with their hard-earned.
The Greens appear to attract two very different kinds of people, some of the hard core activists appear to be people who would have been communists in a previous generation and most of their followers are probably young people who think that Green is Good without having enough economic savvy or experience to know that they are doing. Their capacity to learn and re-think their position will be the key to whether the Greens have reached the high point of their popularity, whether they can gain more support, or whether they sink.