Dy,
boys arent limited there are always new ones entering the pool, the numbers aren’t stagnant.
focusing on the numbers is a sham. The numbers have not changed.
What has changed is the rigidity involved in dating, the amount of research that goes into each date, and limting of venues for boys/girls to meet. The way our shiduch system is set up, the ball is complelty in the guy’s court and the girls are at their mercy. This allows boys to reject girls for inane reasons, read the Yated’s shiduch forum you will find plenty. (example a few weeks ago there was talk of someone rejecting a girl because her father wore blue shirts to work). However becuase it is so rigid and the girl cant really make a move before the boy does, thus out of 112 girls many arent getting dates, and obviously wont get married. Limiting the number of boys wont change that unless some other societal norms are changed.
Note they dont have to be “left-ward” changes getting rid of dating and just setting up pairing up boys and girls likre chasidim too wold get rid of the crises too. This is why they dont hve a crises. They have the same “age-gap” yet no crises, what they do different is their style of dating, whcih is what we do differently compared to our parents as well.