Despite many decades of effort to prevent it, gold-backed alternatives to fiat money are entering the economy. Have you read about BitGold?
http://www.theguardian.com/money/us-money-blog/2015/may/31/bitgold-new-standard-digital-currency
Now, the State of Texas may also be entering the market with it's own secure bullion bank.
http://www.theguardian.com/money/us-money-blog/2015/may/31/bitgold-new-standard-digital-currency
I think as these ideas take hold, demand on gold supplies will increase, as bond yeilds continue crashing. If so, do not be surprised to see interest rates rising along with gold prices.
VP