The real problem stands in the fact that the effective manager does need to have some traits. Moreover, he or she will take responsibility and learns from mistakes. Planning programs for professional societies is another way to develop and document planning abilities. As a team manager you're the line of communication between frontline staff and senior management, so you'll need to be able to communicate with a variety of people from entry-level employees to heads of departments and CEOs in a number of different ways such as via email and social media, over the phone and in presentations, meetings and one-to-ones.
You need to properly highlight what you want from them so that everything can go smoothly. The problem is that a really good salesperson will rarely be a really good manager. Good managers are also able to listen effectively.
It's important to be able to recognise that things don't and won't always go your way. The fact is, though, that these attributes can all be identified and strengthened. Effective leaders encourage and support the company's decisions and directions; they don't undermine them.
That is something that is a lot more important than what many believe at the moment.