No. US and China is not the country in the world. There are more countries in the planeteearth. Two is better than one but in bitcoin two's is not enough to kill bitcoin. Government can stop it if let the world form an office for cryptocurrency to just stop it. That will be their goal by creating the office to let bitcoin be killed. Without like that kind of strategic plan it couldn't kill bitcoin. No one can stop it unless everybody is against to it. While everyone is not against bitcoin will  remain.