The huffing and puffing over President Obama's address to children is far too much ado about nothing (though the now-removed question from the lesson plans was an initial error in judgment).
However, it does remind us that no leader is living with an unlimited calling plan (sorry T-Mobile). The soapbox eventually gets worn down and you no longer can be seen above the crowd if your voice is always the one being heard.
Individuals in leadership need to honor the principle of limited air time, speaking only when they have a unique contribution to make or when a message will be more effectively if voice by them. Otherwise, they should allow, encourage, and amplify other voices.
As with so many other things, less again can be more.