you're going to want cash or another form of value to store your wealth when the banks go to negative interest rates and charge you to hold your money. They are even considering taxing cash to stop you from taking your money out of the banking system, Who in their right mind would pay the bank to keep their hard earned money and possibly call a bank holiday and set capital controls limiting how much of your money you can get out per day. Last crisis we had bail outs for the banks, this time around the will also be doing bail ins where they take your money to keep the banks afloat. It already happened to cypress in greece during 2012.