That's what I'm trying to get to, teemu.
Most gold bugs just want to stand on top of that box and scream gold and/or pegging is the answer, but fail to come up with any proof that it works. You say "never failed", but it almost failed the US multiple times (just check the links I provided earlier).
Jump to present day....now you have Iran trying to start up a bartering system to avoid sanctions, with China AND Russia jumping on board hoarding gold working with Iran to destroy the US Dollar (and why the US is also hoarding gold).
The problem arises when dealing with a global economy that others are not capitalistic, and will do anything to destroy it. Hence, the hoarding of gold, driving up the price creating panic and fear to do anything to destabilize the global markets and bring down the US dollar.
I'm not saying fiat is perfect, but in capitalism it has worked and should continue to work IF the US can stop overspending, which has been the crux of just about every single modern government, not just those with a fiat currency.