Bitcoin is not that powerful yet that it can make banks disappear which are the biggest financial institutions we have and also banks holds support from the Government so Government will never allow bitcoin to replace the banking system.
It is not powerful then it can make the banks disappear? What are you trying to say? Let's say that bitcoin is not that powerful so it won't make the banks disappear. The government of a country is not going to agree if ever there's a threat of making the banks disappearing, because it is a very important body of a country.
That's correct Government will never support bitcoins as it can be threat to their national currency and no Government will be interested in seeing that any digital currency replacing its major currency and if that happens then Government will loose all their control from the money.