Counter question: What did he do to change the game? Make the guard matter? Magic already did that. Lead a team as a guard? Magic again. Noncenter? Bird and Magic. "flying"? Look up Dr. J.
Amazing player, possibly the best player of all time. Not sure if he revolutionized the game, as the Center position is, once again, the most dominant position in the game (Shaq, Duncan, Wallace), and it was for the two years he was out (Dream). The only time that the Center was NOT the most dominant position in the game was during the middle to late 80s and the early to middle 90s, also known as the Magic, Bird, and Jordan eras. Otherwise, the game has always been dominated by big men.