when the us dollar crashes

I'd imagine the whole world would tumble.

the aussie dollar will be tradable for many many many us dollars something like

10:1

at first then all the dramas will start

Wishful thinking on your part as all economies are intertwined and if one falters so will the rest as a countries economic growth depends upon a counties ability to provide exportable goods along with a countries ability to purchase another countries goods.

All those gold bars people bought will be as useful as so many yellow chunks of SHIT..as NO one will part with their food for ANY price..let alone a chunk of rather useless metal.

Bitcoin is popping as the dollar weakens

I would think the Au dollar would fall, too. Much of the strength of the Australian dollar comes from exports to China, much of whose exports supply the US and Europe. It'll be a domino effect and nobody will escape it.

I think ultimate reslience will be found in the ability for countries to fend for themselves. China is a net food importer as is Russia. The US is by far the biggest food producer in the world. I have no idea how Australia fares in food production.

When it comes to energy the US would do very well. In a depressed economy our demand for fuel would drop enough that domestic sources would supply us. Domestic production has been rising at a rate that if it continues would make us oil independent in a couple of decades anyway. Natural gas is so plentiful here that that would be no concern. We hold the largest coal reserves in the world.

In a depressed economy there is really nothing the US needs that it doesn't already have.