When my uncle Stas married in the 1940s, he and his bride Pauline moved into the $30 monthly cold-water three-bedroom flat in Jersey City, New Jersey. It was already inhabited by my grandparents from Poland, their adult daughter Anna and her husband Richie, and a nephew John who just arrived from "the old country."
Today, Stas and Anna would be called "Boomerang Kids." John would be labeled a "loser." The grandparents "enablers." At least for the time being. Soon enough, those classifications will seem out of touch.
In The New York Times in the high-profile article about adult children returning home, Adam Davidson does discuss the economic changes taking place in America. Here is that article.
Those developments, just like immigrant poverty in the mid 20th century, could bring back the extended family or multi-generational household. That would not only solve the problem of ponying up the monthly rent or mortgage. It would also ensure the aging could remain in-place in their apartments or homes. Caring for them would be myriad relatives, by blood and marriage.
Of course, "family" has acquired many new meanings. In graduate school, my "family" became the women of all ages bunking at a boarding house on South Division Street and renting a house on State Street in Ann Arbor, Michigan. I had everything I needed in the way of companionship, emotional support and concrete help when sick - all while paying peanuts to keep a roof over my head.
Fellow Baby Boomers and I discuss becoming activists who return boarding houses to communities. Real estate developers might focus on that as the next kind of profit center.