The founder of Risk Reversal Advisors, Dan Nathan, says the U.S. government won't allow businesses to substitute Bitcoin for dollars. He says the government won't "let the dollar fall away from being the reserve currency for the world." His comments follow the news of Tesla's Elon Musk investing $1.5 billion in bitcoin and preparing as a means of payment to enable the cryptocurrency. Analysts are forecasting that the same will be achieved by a flood of firms.