Dear Libbi,
You say ten percent. Can you back it up? It sounds like UFO sightings. Where is the data?
Now, let’s make up that it is ninety five percent. It is still worth it for everyone, for the learning boy to keep learning. When the other boys get married has no bearing on when the learning boy should marry. There is not a nidnud issur in a learning boy delaying marriage.
Leave the Chofetz Chaim and the Chazon Ish for those that are learning. Meanwhile you can come up with the data.
Kollel in a week learns what solid single guys cover in a weekend.