In my opinion Bob Dylan's words sound really great but it's not true key to be a "success man". It's not possible to do only what we want all life. People even if they have a money, fame, achievements have a responsibilities. Responsibilities without which they could not be considered as a "success man" in Bob Dylan's definition. And I'm sure that sometimes they feel that they don't want to do it, want to resign from it and change their plans but it's impossible.
For me being a "success man" doesn't depend on do all the time what we want. For me it's feel happy even if happiness is difficult to achieve, it's make a smile upon a faces who we love. It is a true and pure a way to being a success man