There are no one-size-fits all arrangements of the family and society. There will always be exceptions, not to the official rule but to the common assumption or societal expectation. Today, the career is the expectation and assumption and the family is a lifestyle choice, with the one-income family considered a subculture. You can tell this is so by the demand for "equity" meaning that we have as a goal getting more professions to be 50% women. That is a bad goal with no basis in anything other that the assumption that the only reason it isn't already like that is sexism.
Everything tailors to the normal, as it should. When we talk about, say, a 5th grade reading level, we aren't mandating that anyone be at that level. You might have had a college level reading ability in 5th grade. Or you might be barely literate. But the norm sets the expected lesson plans and coursework, and if you are exceptional you need an exceptional route or will struggle with the normal plan. The question is the degree to which young people should grow up with the expectation that they will marry and have children, and if they do, with the expectation that they should maintain two full-time careers throughout.
I think the "new normal" in the middle class, that both boys and girls will grow up, go to college, get careers "in their major," and then see if family can fit into that is not healthy. I don't think it makes the most people happy. I think it makes exceptional people less unhappy than they might otherwise be for feeling abnormal. I also don't think it is the best thing for neighborhoods, churches, towns and society generally. If you find a place with a high percentage of traditional, nuclear, one-income (or one main income) families, I think you'll have found a place that most people would like to live, a place with a generally low crime rate, low poverty rate, low dropout rate, etc.
The problem is, trying to achieve that when it isn't considered normal or the expectation for most people is extremely difficult. It is like trying to a get a date for prom when nobody organized a prom. Only when prom is a thing (something not everybody has to do, bjut many people do and it is endorsed or sponsored, so to speak, by society, does someone find themselves dressed up at a dance with a member of the opposite sex. The people who would really like to form traditional families don't have a context to make it happen apart from emerging sub-cultures, which often come with other difficulties.
Family is built-in, biological (for normal people) fulfillment. We see so many young people adrift and despairing for a lot of reasons, but one of the big ones is that they typically are not married with children and attempting to be king and queen of a domain (no matter how small) all their own.