Commitment is the one quality above all others that enables a potential leader to become a successful leader. Without commitment, there can be no success.
To determine whether your people are committed, first you must make sure they know what it will cost them to become a leader. That means that you must be sure not to undersell the job. Let them know what it's going to take to do it. Only then will they know what they are committing to. If they won't commit, don't go any further in the equipping process. Don't waste your time.