Of course he changed the game. Before he came to the scene, the league was dominated by Centers. His explosive slashing moves to the basket, handling of the ball, great shooting, and a great post up game was lacking in many shooting guards at the time as well. When he came, that changed because players "wanted to be like Mike". He even changed how defense was played at the perimeter. His impact was so dramatic that the league eventually outlawed hand-checking to make the game "more enjoyable" and to make it possible for other athletic guards after MJ retired to blossom into the "next MJ".