Need help on management and leadership (125 or so words)

If a manager wants to be a leader, he must develop the ability to coach others. It is core skill required of every successful manager in the 21st century. The days of command and control leadership as a standard way of managing people are long gone. Coaching and collaboration have taken over as the most effective way for managers to lead. If managers do not become skilled at coaching their employees, it is unlikely that they will be able to achieve sustainable long-term positive results for themselves or their organizations.

Do you agree?

Please elaborate in about 125 or so words