Somebody should find the 10 top U.S. parishes that have produced the highest number of priestly vocations per 1000 parishioners; and the 10 top dioceses. Interview the newly-ordained priests, their former pastors, and their bishops, and find the common factors which would account for the high number of ordinations, and then work out an action plan to boost vocations in other parishes and diocese -- but only ones who woud enthusiastically volunteer to work on the same targeted plan.
Hasn't anybody done this yet?
The more traditional the parish, the more vocations they produce. For example, St. Agnes in St. Paul MN has at least 12 seminarians, SS Cyrill & Methodius in the Detroit Arcdiocese from what I heard is going to have 10 of its men in the seminary come this fall, and these arent suburban mega parishes, they both probably have 1,500 parishoners eatch.