Number 4 has already been tested in Venezuela. In those circumstances it has been tested.

I say this as I have had some dealings with gold and silver coins with buying and selling.... The downfall of gold and silver in economic crisis is that its hard to hide in modern times. In the 1930's you could hide your silver coins sewn into your coat (which was very useful for Jewish persons emigrating/escaping from Germany post 1936).

HOWEVER, they didn't have metal detectors. I am often reluctant to travel with Silver Morgan's on the airplane anyways... Although perfectly legal, if you travel with a roll, it does raise a few eyebrows with the TSA. I'm sure in a Venezuelan airport, it is against local law and most likely would get confiscated (most likely not even handed over to the real government and pocketed).

So for families who want to send value back home, BTC is the most secure and most viable as if gold or silver became popular, thieves or corrupt police would just use a wand metal detector on you or through you house.

Its easier to hide a 30 wallet passphrase in a note or letter in a book etc.

Also... This stuff is heavy. I've never been lucky enough to own a bar of gold, but rolls of silver eagles are a bit hefty.