What evidence is there to support the belief that abolishing mandatory celibacy will lead to an influx of new aspirants?

Vatican: The Pope has announced that there is to be no change in the Catholic Church's rule on mandatory celibacy for its priests.

He adheres to all its teachings and doctrines, including those on abortion, same-sex marriage, the use of contraceptive methods, women priests, and mandatory celibacy.

Mandatory celibacy is a cruel injustice and abuse of men who are called to ministry, but not celibacy.

Mandatory celibacy in the Catholic priesthood "has to be looked at", a prominent priest and commentator has said.