The renminbi’s status as a reserve currency has been impeded by the Chinese government’s unwillingness to free up its exchange rate, allowing the currency’s external value to be determined by market forces, and to fully open the capital account.
Countries who can't agree with the US will move into currency-swaps and barters. I don't see them going for Crypto since that's even more scary for central banks than the US dollar.
This doesn't mention FATCA and the possible war the US has been waging on Switzerland and other off-shore financial centers. This seems quite China-centeric (China + resources that China needs/oil).
As oil, gold and other commodities start being available with Crypto, the USD will fade to insignificance. How is the USD responsible in any way for bitcoin being successful?