What are you basing any of this of off? Poorer cultures have maintained marriage and family through much harder times. Marriage itself being expensive is a societal construct. People living together in family or communial settings have it much better off alone. And its a proven fact......
Not gonna quote your whole post but you hit the nail on the head. Society has set different expectations for women and men in our current age. And those expectations don't converge into taking up the mantle of marriage.