Gold as escape money worked very well during ww2 and a few years afterwards, but nowadays, it's become quite useless. Even in the United States where gold posession is rather common and innoculous, there's very few places one could exchange gold for currency or services without raising suspicion.
Investing in something that is not affected by financial collapse is looking for a solution to a non-existant problem. There is little in the world today that would destroy a financial system and render first world currencies worthless. When the two planes crashed into the twin towers, the US dollar and the British pound still bought goods and services. When the August blackout crippled parts of Canada and The northeast US, you could not access your bank account, but cash still bought your necessities.