Something I've read often, is to collect as much change as you can. I regularly bring home many rolls of nickels from the bank. If the dollar bill gets devalued, let's say by a factor of ten, your nickel is then worth 50 cents (goes up by a factor of ten). That's because the government will recall paper money but won't bother recalling coinage. May happen again soon.
The ten planks of the communist manifesto pretty much sum up why they want to go cashless.
The first plank states:
“Abolition of private property and the application of all rent to public purpose”
If all your money is in electronic form it is pretty easy to take from you.
Number four states:
“Confiscation of the property of all emigrants and rebels”
So If you try to leave before they get everything in place to trap you they just take all you have saved.
Seems to me it is just one of the steps needed to become a communist country.