He is and shall be!
It seems to me that the first question to be asked is: "What is the source of the decline?"
People move. In some places the people have left to move to greener pastures. Here, the Church must follow them. And make decisions about whether the old location is still suitable for a parish, perhaps to reach out the unchurched who still live there. But I think for some parishes in PA and elsewhere this is not the reason.
Very often the issue is with either a poor quality of liturgical worship, lack of community in the parish, or both (the two are mutually dependent).
As to vocations, there is a direct relationship between the quality of liturgical worship, the community in the parish, and the number of vocations the parish grows.