I understand your point, but I have to disagree in some parts. I have to first claim that this is in fact a system that can be changed for something better. But what I don't agree with is that somehow I can read underlines that you are suggesting a change into a precious metal based system.

Please correct me if I am wrong.

But in case that is indeed what you are suggesting, let me tell you the amount of gold, silver and copper is finite and not enough to sustain all the worforce a country like the USA has, let alone the whole world.
Just take for instance the technology industry we have nowadays. It would just not be possible today if it weren't for the current system.

Because it is not true that a currency like the dollar is merely based on trust (althouh it is true that it's its biggest value) because that trust is based on what the country has to offer. Technology, its workforce, military, power, all of those factors sustain in a way the value it pocesses.
Could its value crush over night? Absolutely!
So far it has endured over time, but no one knows for sure if it will forever. But claiming that it is unsustainable might just be too much.

Btw, I much prefer having corporations controlling the currency and not the state. States can be currupted, and change their whole vision of a country's future at any given time. That's one of the biggest reasons my country, Venezuela, is going through such a hard time. The government controls pretty much everything, and only acts in order to remain in power.

Good explaination, though!