What point are you trying to make here, specifically? Money hasn't been backed by gold since the 70's. Dollars are backed by the government itself. The bitcoin shills keep saying 'FIAT DOLLARS' like the US dollar is going to fail tomorrow. If the US dollar fails, the entire world economy fails, and even those that are invested in buying gold/silver are completely fucked. ALSO all of your bitcoins will immediately be absolutely worthless.
As for fractional banking, it's been done that way for far longer than bitcoin or the actual reasons the economy crashed. Putting that as the example for why bitcoin is great is laughable at best.