Can you pinpoint the cause of the shidduch crisis?

I have a little debate in the comments about the mathematics presented a year or two ago that proposed men dating women closer to their age or older as the solution. Somehow they come up with a prediction of 108 single women for every 100 single men resulting from men opting for women 3 or more years younger. This is brought up in the comments on Wolfish Musings' replication of a woman's suggestion for allowing singles to meet at weddings.
Wolfish Musings: A Common Sense Shidduch Suggestion... That's Doomed To Failure