I'm sure everyone has seen the clip by now. If you haven't Google it.
USD is the world's reserve currency, china holds over 3T USD alone. USD stabilizes local currencies around the globe. If China decides to cash out their USD for a cryptocurrency. It would crash the USD, US economy and the US would lose it's world power status. This is a very real threat that in my opinion is inevitable
If this scares you I would recommend researching the technology behind crypto and buying the best one. Even a small amount of a crypto that will become the world's new reserve currency will lead to incredible gains. I have my opinion on which crypto I think will succeed but I don't want to be labeled a shill