I am, admittedly, new to Bitcoin but this question never leaves me. If bitcoin is not a bubble, if bitcoin somehow makes itself the international standard currency, what happens to the people who never bought bitcoin? Will they be provided a timeframe in which they will have to exchange their money from traditional currency to the cryptocurrency before traditional currency is phased out and deemed worthless or will there be another method of transition?
You haven't really got a grasp on what currency is, its just a store of value. If bitcoin were(which it won't) to start taking over fiat in all cases your fiat would still be able to be exchanges to bitcoin, it wouldn't just become worthless out of nowhere.