What has happened to the 'art' of speech-writing and speech making?

Where are the men and women whose words set the heart racing with passion, turn battles, inspire populations to extraordinary endeavour: 'Ask not what your country can do for you.' 'We shall fight on the beaches.' 'I have a dream.' 'The only thing we have to fear is fear itself.' Quote these words today and they still have the power to stop us in our tracks.