I’m speaking of the general yeshivish community, and I’m hearing more and more about it, but it seems to be the dirty little secret that no one is willing to say. Birth rate does not account for those who marry people not included in the original accounting. I’d still like some actual proof that there are more single girls than boys, not based on an assumed birthrate in a specific community or graduation rate. And why should I go on someone else’s say so when my own experience proves otherwise (and most roshei yeshiva, shadchanim and singles do not support)?
I agree with your last paragraph (as I understand it) but I’m not sure how that helps your argument.