Why is China so good at table tennis?

We all know that China's national sport is table tennis  and  they take the sport seriously. I came across Jan-Ove Waldner's CGTN Europe interview and he threw staggering numbers that might further explain why it's almost impossible to dethrone the Chinese at the sports of table tennis. 

He said there are about 30 million Chinese who play table tennis vs 10,000 Swedish players. 😮 

China has been the sports of table tennis 4-5 decades. Will they ever be a country that will be a serious contender?