I have no idea what legislators and judges have to do with it. If people want change, they'll organize themselves into an effective force to effect change things. At least, that's how it has worked in the past in our own country, I don't know about Australia. Perhaps things are merely as the article states: that a growing number of young men see the family court system as draconian and anti-male, and they are taking what steps they can to stay out of its gunsights.
Or it could be that a new dynamic has formed from both sides in which marriage as we have known it is not attractive to either of them. Look, if people want to marry they'll figure out a way to do it. Obviously the non-marriage trend is a choice both are making. I don't think it is one sex or the other who is bottlenecking marriage. It's likely that both don't have the same incentives to marry they once did.
Your own premise would seem to be that the 20-something women are in favor of these laws, and they are the power which keeps them in force.
That is not my premis. However, to the extent that divorce laws keep people from marrying in the first place (and I'm not convinced they do) inequitable marriage and property laws kept women from marrying in earlier times. So, perhaps the pendulum has swung the other way.
In that case it would seem that inequitable laws may keep people from marrying, but the reason I'm not convinced is because people who are intent on marrying will anyway (and always have). Today they have the added option of setting their own terms and conditions (pre-nuptials, etc).
Also the author doesn't take note of the fact that divorce is no picnic, no matter what perks you might end up with. (And I don't think women consider having 100% responsiblity for the hands on care of kids as a perk ... it's hard work). Maybe people don't marry because they don't want to risk divorce. That would include women, who even according to the author, are having "relationships" with non-marriage inclined men, presumably not at gunpoint.
Also, he seems to be stereotyping women's motive for marriage as gold digging and men's motive in marriage as getting a iron-clad deal in which effort into the relationship in not required once the ink is dry on the paperwork. Overall, a pretty damned cynical marriage. The truth is even the best marriage takes lots of time, work and sacrifice, things for which few people these days have time or inclination.
Sweetiepie, trot down to your very own county recorder's office and take a look at the ownership of real property during "earlier" times. Notice how many names are female. Now, guess how much of this real property came to be in female hands (hint: it's one word, beginning with an "m" and ending with an "e" and has 8 letters). 
If that contention were true, how would you explain how most divorcing wives seek primary custody of the kids even when the father wants to raise them???