Making the Yuan digital is not going to change anything, the reserve currency will still be USD and there maybe some countries accepting as Yuan itself but it is not going to affect the price of US dollar globally. But USD has reasons as well to fall since more money printed in short time made the value to be inflated in the next few months...
although many countries prefer to use USD for transactions around the world, China is trying to beat USD by making Yuan, but unfortunately there are still many countries that have not accepted Yuan as an international currency.