I think you are mistaken with how long before this is going to happen. Europe is already experiencing the effects and this winter will feel the full effects of this. The US is probably got a bit more time... but Russia, China, India, etc are working on bypassing the US Dollar for their trade, reducing the amount of trade that occurs in US Dollars. As for reserve currency status, the politicians have also made the US dollar more unfriendly when they froze the Russian Central banks reserves. This will result in other countries reconsidering where they store their wealth.