Perhaps the real problem with such "thought-leaders" is that they spend all of their time thinking and little of it listening.  There's an interesting pschological phenomenon called next-in-line effect (I didn't name it...  it just is..)  When we go around a circle in order sharing ideas, people stop listening when it gets close to their turn because they are thinking about what they are going to say.  A lot of times they end up repeating others ideas, as they didn't hear them the first time.  They don't remember that an idea was already said.  Would love to know what you think about this idea.