While this is undeniably true, deferring childbirth the length of a traditional full-time undergraduate program immediately following high-school doesn't get you anywhere close to the age where that's an issue, so that concern isn't a good argument for a part-time “mommy track”. Conversely, part-time education for re-entering students is already a thing, though not necessarily well-supported by top-tier institutions. (Unfortunately, recently it's also one of the major focus of private for-profit predatory scam institutions, and federal efforts to fight that problem have been parked back under the current administration, so there are problems to address.)
> Historically, we resolved these conflicts by having women have babies young, but with a financially established husband who was typically older. Now, that is decried as evil patriarchy.
No, women choosing for themselves to resolve the balance of concerns that way is not, even by most people who decry the existence of “evil patriarchy”, described as an example of that problem. Women being externally compelled to do so without meaningful options—sometimes at ages where meaningful consent would be unlikely even if the girl had a choice—as has been true in many historical conditions and sometimes true in some places today may be, but that's because of the lack of women's (or girls') agency in the decision, not the outcome.