We must build a new exchange rate system based on the quantity of money in existence. For example the bitcoin/U.S. dollar exchange rate should be: 1 bitcoin = 500.000 U.S. dollars because all the U.S. dollars in the world are 10.5 trillion. (10.5 trillion/21 million = 500.000).
What do you think about this idea?
If you can convince people to buy it for that much, and equally convince others to not sell for lower than that value, sure. Knock yourself out.
Bitcoin is a relatively free market, there is no way to force people to buy or sell for values as massive as that. You can't force a fixed rate.
Also it shouldn't be tied to just the value of USD in existence. If the USD was backed by all the Bitcoin in the world something like this would make sense, but it isn't, so that's not applicable.
Run the numbers with close to $10 quadrillion. That is approx. the global economy value, including market valuations, metals, futures, etc.