Cashless society is coming, slowly but steadily.
People were first signed up to receive their salary in bank account. Then pensioners started receiving their pensions in bank account. Then all child payments like child support, allowance, allimony and others. Then all welfare... Then credit/debit card shopping, then online banking, etc etc.... Every payment gets mopped up by a bank.
And now that all payments go through a bank, they start banning cash, and when cash is done, your life and finances will be 100% controlled by a bank.
So when they start bailing in your account, you have nowhere to go and you will lose all your money..... But thank God we have Bitcoin, Precious Metals, Steem and other cryptocurrencies to defend against this!
Don't worry soon they will have control on all cryptocurrencies.
How?
I also don't know the answer. But they will do it.
Currently the cryptocurrencies are the most secure storage vehicle in my opinion and their networks are very robust. I think the weak points are the exchanges, where the government can seize your money. But there will be decentralized counterparts to that too.
I'm sure they will try, yes.
Not as sure they will succeed, however.