I totally agree with you that China cant bring Bitcoin down. As we saw last month that after China banned ICO's and Exchanges, there was a huge drop in the price of Bitcoin. But now it's price is increasing again at a very fast rate and soon it is expected to touch $5k. Bitcoin is decentralized and government has no control over it . Some decisions and statements by a person or country can temporarily effect Bitcoin but they cannot have a long term effect.The demand for Bitcoin is increasing as people have started to understand its value. As the demand will increase its price will also increase.So i dont think China or any other country can bring Bitcoin down.If the price of Bitcoin will drop again, it will surely rise again and it will achieve its ATH value.