Damnit that sucks if that happens. Thats why BTC is better (no one can freeze your account)
If you are law abiding citizen and you have no debts then there is very little chance that your bank's account will be freezed. I hate banks in general, they are part of old system designed to rip out every penny from people, but I did not see many cases of freezing accounts without proofs that this account is indeed owned by dishonest fraudster. I may be wrong tho.
When the government is in trouble, they can always take a bite out of your bank account. Thank Cyprus.