Often the prayer for vocations during the Sunday Masses' Prayer of the Faithful at my parish is along the lines of, "That holy men and women will answer a call to the priesthood or religious life, we pray to the Lord."
If that were to happen, it'd be swell, but I can't help thinking that there's no particular need for the men and women who answer a call to the priesthood or religious life to be holy. In fact, I'm not sure I'd want anyone to be ordained who heard that prayer and said to himself, "Say, I'm holy! Maybe I should think about becoming a priest."
Maybe my standards are too low, but I'd be perfectly happy if plenty of non-holy men and women answer a call to the priesthood or religious life with the hope that they will become holy through living out their call. (Heck, some might even be fervent atheists when they first start hearing things.)