I did not talk to this reporter, but it feels like a word for word account of my classroom lecture on this issue:
The explicit coercion of that era gave way to domestic adoption industry we have today—which is regulated by an inconsistent patchwork of state laws, unlike the federal regulations applied to international and foster care adoptions. And gradually, demand grew: By the mid-70s, increased access to birth control and legalized abortion and lessening stigma of single parenthood plummeted the supply of healthy white babies. In 2014, approximately 18,000 infants were placed for domestic adoption. In 2017, the CEO of the National Council for Adoption estimated that around one million families are trying to adopt at any given time in the U.S.
I have yet to find a replacement for the type of research the Donaldson Institute did–sadly it wound down operations a couple of years ago.