- Governments will want to steal people's gold in the future (they already did once)
I find this unlikely. When this happened last in the US, gold was how most people saved for old age. These days, that is done via 401k's and IRA retirement accounts. There is much more value for a failing government to steal in those accounts than all of the privately owned gold in our modern world. And since those accounts were created as tax-defered savings vehicles by acts of Congress, it's hard to argue that Congress can't just change it's mind on that issue, for the "greater good" and all that. For that matter, there has been talk of 'nationalizing' private retirement accounts by certain persons on the far left of the political spectrum in Congress since the big health care law was passed. It's simply the next box to get a checkmark in their social agenda.
