This is still a question nowadays because not all country gives a go signal for bitcoin. They are taking a lot of things just to slow down the growth of this currency. If not eliminate the whole system. What can you say guys.
If the banks will lost their one half investors and shift into bitcoin their profit will decrease badly and if it happens continuously their future will clearly a disaster and then the government also can be affected because bitcoin is decentralised and as long as it is not declared by the government as legal they will gain nothing from bitcoin. I believe that the very reason of not letting bitcoin works freely is because they are trying to create something that can be an instrument to counterfeit it.