I would actually disagree about marriage benefiting men to the detriment of women. If fact I think these days you could say it's the other way around and the trend towards having families outside of married but living together is leaving women (and their children) very vulnerable. Man don't have to 'take on' a wife in order to have sex and somebody to cook, clean and have children for them.
Men still earn more than women, women are still the primary care givers (and I for one couldn't wait to give up my job to stay home with my children, although I may not be typical). Being married gives me and my children a load more security than if I wasn't married and also makes it a lot harder of DH to cut us off without a penny. You might want to argue that the only reason men earn more than women is because of marriage though. In my view, let them earn more, I don't want to work 60 hour weeks to get there. I don't really care a great deal about money and would rather have the time with my children. As I said though, I may not be typical.
That is of course being very cold and hard about it. I also benefit from the love, companionship, sex, laughs within our family which co-habiting couples also benefit from. This isn't to say single people don't have every bit as much joy in their lives, it's just that theirs doesn't come from a partner.
It was mentioned up thread that working class men offer women a better chance when it comes to having children. Maybe that's the solution if you like. High earning man should date low earning (much younger) women who want to stay at home to look after children. High earning women should look for low earning men who want to stay home and look after children
In all seriousness though, one partner at work and one at home works great, so we should actually raise the status of being home looking after children so that more men are willing to do it.
It's such a shame we can't just shunt our fertile years ten years forward back, so you can't get pregnant at 12 but can at 45 instead.
I imagine this anxiety about never getting to have children starts about 30 (?) do you then come out of it the other side, when you get to 45 say and feel ok about things then? I have quite a few single female friends around mid 40s, they know they're past their fertile days. To me they seem to have a great life, money, social life, career, I don't envy their careers (too much hard work!) but I do envy the status it gives them. I know almost all of them really longed for children and that 30- 40 age was difficult for them.