A hare can be outrun by a tortoise. Dalian Wanda Group Co.'s Wang Jianlin should have heeded the ancient wisdom and stuck with real estate.The conglomerate's fall from grace has been swift. As recently as 2015, Wanda was the fourth-largest property developer in China, generating 151 billion yuan (23.2 billion dollars) in sales, according to data from China Real Estate Information Corp.