No one can predict what exactly will happen in the future. In the event of a nuclear war, they can turn off electricity and the Internet, no currency will have value.
That is so true, and thats why i own a safe at home stocked with gold, silver and canned food haha!
Diversify, never believe in just one thing as nobody can ever now 
Diversity is needed, but as for me all of their savings to keep in the safe is also dangerous. It is necessary to lay out on different cells.