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
We need to understand and accept the fact that Bitcoin cannot completely replace the current monetary system because it's not only the people who are using fiat currencies and banks for their financial activities; how do you think governments and countries will manage everything with an unstable currency? A country having reserves in Bitcoin will always be in danger of losing value for its reserves if the price falls, which we know happens.
So, even if Bitcoin becomes globally accepted as a payment method, fiat currencies and current financial institutions will still be around. It will just be your choice for when you want to use them and when you don't. If you, as an individual, don't need them at all, you can abandon their services and use cryptocurrencies for all your financial activities if you know it's possible.
And, even for that to happen, we will need to wait for years and decades, because it won't be easy for all governments to let that happen, and without all countries accepting and allowing it, it won't be a global thing.