China has a many advantage over USA which can make them over take USA easily but also a big issue which can drag them back too.. The issue is their confrontation attitude with most of countries, and once the small countries get opportunity they will definitely favor the odds which can hurt china bad...
Example, South China sea, Doklam issue and many other with neighbors countries.. Instead if china make a healthy ties and work constructively with Asian countries then they whole can take over west, whose govt. had dominated the whole world based the cunning trick of initiating wars and selling their weapons.