As long as people use USD to measure value, it won't collapse. And so far people have no better alternative. A standard unit of value must come from powerful authority, just like meter, second, kilogram or IP address
Meter and second are neutral properties where the standard-maker has no way to abuse his power. Money is also a standard, but the issuer has the power to abuse his position.
BTW, abuse of money is thousands of years old. Even in the days of gold and silver, Kings and Caesars would coin metal and stamp it with an inflated value compared to the value of the underlying metal. Sometimes this "seigniorage" was huge, depending on the current fiscal or political situation.
Historically, every human-imposed monetary standard has failed to maintain the purchasing power of the standard's unit of value. The unique thing about bitcoin is that human creation of the money is limited by the system.
