I'm looking at the original research [1] and it looks as if the percentage of people living alone or as single parents has increased significantly (like 3-5x). Which doesn't invalidate your point.

The headline here should be that married or cohabitating has dropped and all the other categories have increased.

[1]http://www.pewsocialtrends.org/2016/05/24/for-first-time-in-...