Is it a crisis, though? In any endeavour that involves matching and selection, such as employment (shidduchs between workers and jobs) there is bound to be some transient displacement due to the right job and the right worker just having not found each other yet. The same is true with marriage shidduchim.
The Bureau of Labor Statistics considers about 4% unemployment to be full employment, since that’s about the number of people who are unemployed while waiting for a job to come along, etc.
What percentage of single girls of advanced age, who wish to get married, and have been trying, not found their match? What sort of %ages are we talking about?