There was a disasterous shidduch crisis among the “baby boomers” – but it was among the seculars, and in particular the secular Jews. Many of the non-frum Jews of the baby boomer generation failed miserably at reproducing. As a result, subsequent generations are radically reduced. Combined with our birth rate, that “crisis” is a major reason why the percentage of Shomer Shabbos among Jews has climbed radically over the last 50 years.
The primary “proof” of a shidduch crisis is a falling birth rate and what that results in (schools closing for lack of students, pediatricians retraining to specialize in geiatrics, etc.).