Your argument basically presupposes that there’s something desirable about suburban homes, and that people not buying them is abnormal. I find this both unconvincing and historically incoherent.
https://www.businessinsider.com/do-it-for-denmark-ad-campaig...
It's not shaming to point out a thing is happening or that it a thing is biologically necessary to further the human race. You're welcome to call it anything you want, but there's a lot of "shaming" that's gone in the other direction as well. I've watched it my entire life.
Desired home locations are just a side effect.
That is after all, how humanity worked for a few Millenia.
You're arguing for the Amish.
Even today, with a global fertility rate of 2.5 children per woman and a population of over 7 billion people I don't think there's any need to worry about biological mandates. On the contrary, I think that in developed countries where each human being consumes much more (and consequently generates more waste) than other countries the birth rate should be heavily lowered. Of course, our economy/society may not be engineered for that but better start doing it sooner than later.
On the other hand, getting eaten by a tiger, living with ringworms, having your teeth fall out before middle age, or having 50/50 odds of dying by the age of 4 is perfectly natural, does not go against biology.
I don't think biology is a great litmus test for how we want to structure society.
Which is a natural expectation of the species...
No, because they don't believe they're financially stable enough to support children[1]. Millennials have dealt with stagnant wages and rising housing costs.
(While some of the responses to that story ([1]) do indicate a desire to do things other than raise children, many of the responses indicate a desire, but a lack of ability. Additionally, leveling off the population growth of humanity would likely have benefits for the environment, though certainly some current government schemes assume infinite growth, and those will have a bad time.)
I'm personally in the "can't" not "won't" bucket. Real-estate in SV is nuts, and I will have to (as James Mickens calls it) complete the "sisyphean task" of escaping SV and its housing crisis.
[1]: https://www.nytimes.com/2018/07/05/upshot/americans-are-havi...