Those who aren't from the radical fringe will begin to get the idea that they don't fit unless they are single or jobless or willing to work for free on a part-time basis. The goal is for the average person to be involved in significant ministry, not just the radicals. Be encouraging to the radical types. Thank God for them and the gifts they bring. I know the feeling of relief that comes when all the leadership slots in a ministry area have been filled at least temporarily.
Effective leaders look for new leaders constantly.
Turn your radar on at all times when you are mingling with your people. God is answering your prayers for leaders if you will just look for them. However, I have discovered that some of the best leaders will not volunteer their way forward. They will wait until someone formally recruits them. It is a simple principle - invite many into leadership training.