I'm not sure in detail how this works. That congregation hasn't been closed, it's just no longer subsidised and now has a lay vicar. Average attendance has fallen from 30 to 28. In diocesan events, parishes of like sizes are grouped together in educational, training, and lessons-learned sharing sessions, not parishes which are geographic neighbors. It seems that size really is a better indicator of what congregations have in common than is geographic proximity.
Size thus turns out to be a much more effective basis for inter-parish community and learning.
If a particular congregation isn't nearly as large as demographics say it should be, and if it really doesn't want to grow, then that's OK, and the Diocese will plant another a few blocks away. When the Bishop comes for a visitation, he expects the parish to show him 10-year graphs of membership, attendance, and financial trends. After a period of concern, morale is now generally UP among the clergy, because both the vision and each person's role in the vision are clear, although there are still some holdouts for the old therapeutic model. These results are just what you would expect from standard secular organizational leadership theory. The Bishop repeats the vision over and over, year after year.