Current payment systems simply can’t compete with bitcoin’s fees, security and convenience.  Why spend hundreds of thousands of dollars on bank fees per year and lose hair as money transfers bounce from bank to bank during a wire transfer sometimes taking days to reach its destination, when it can clear within minutes and for mere pennies?  As a currency, no sovereign can match it.  As a payment system, no financial institution can compete with it.  As a distributed network, no government can stop it.