The ‘ rules’ or traits or capabilities -or whatever you may call them -of leadership don’t change. For example, ability to learn quickly, ‘walking’ around to understand what is happening, respect for individuals and many such things have always been leaders’ capabilities. So also, the ability to see big(ger) picture, practicing values, and ability to develop people have always been important for leadership.
Businesses, markets, technologies, offerings change. e.g. trawling the net and participation in social media interaction may be today’s equivalent of ‘walking’ around.
Let us understand and learn the first principles of leadership well. Let us also learn about markets, businesses, technologies, cultures etc well. Both are important, but let us not get mixed up about them.