Everyone is not going to be a star athlete. However, everyone can benefit from playing a sport. People learn the importance of working together as a team when they play a sport. Teamwork can benefit you in other areas of life. For example, if you are in school, then it will be easier for you to work with your classmates on projects. You will also have an easier time working with your co-workers.
It isn't always easy to play a sport. You will have to deal with both wins and losses. However, this will teach you how you can handle adversity. Thicker skin will make it easier for you to deal with life's challenges.
Additionally, sports will teach you how to work with authority. You will have to deal with figures of authority for the rest of your life. The earlier you learn this, the easier it will be for you to respect authority.