If Bitcoin becoming a mainstream payment system in the future there will be no banks controlling our money ,and the ideal of faster more cheap international payment will be more interesting . imagine sending money to someone with out any fees ,well it will mainly reduce the government control over citizen ,but first bitcoin most become known to the world .so what are your taught on this topic
It is quite impossible to happen because small transactions may still be cheaper to transact through banks so banks will still exist and be used, also don't forget the government that will always support banks because that is one way they track the wealth of their citizens.
Discussions about Bitcoin replacing banks have been discussed even before Bitcoin was this big and you see the bigger Bitcoin is, the banks are still there and Bitcoin lovers still use banks to receive their Bitcoin sales to fiat.