This idea is absolutely ridiculous. So is not letting kids go to school until all kids find a school. There could be literally hundreds of kids without school just because of one kid? and fifty girls in a grade in school cant get married because one girl cant find the right guy? so ridiculous.
I want to offer a perspective that everyone might not agree with: not everyone can get married at 20. Some people will get married at 30. Some at 40. I just had an uncle get married at 50. Some people may never get married. And that’s okay. If you want to get married then try to get married. If Hashem wants it to happen it will happen. if not then not. You dont need a spouse to be a righteous person. You don’t necesarily need anyone other than yourself to complete your tafkid in life. I dont think there is a shiduch crisis. I think the current situation was meant to be. I think we need to do lots of hishtadlus in making shiduchim. but some people may get married late or never. thats just how it is. and if you get married early mazal tov thats great. (though that can come with some cons of its own, so not always better, depends on the person).