Bitcoin have an potential to overtake dollar in future, but at a moment it seems that people will only use bitcoin, as many of people are not aware about bitcoin and people who are comfortable with dollar will continue to use it.
bitcoin is fairly easy because it can be performed remotely ( online ) from any investor resides . Only by turning on a computer or smartphone and internet network..
Bitcoin is getting more and more investors that are and wanna take advantage of its growing value ,for other side dollars is a good investment as it has more trust. using both of them can be a good idea
People who are comfortable with using dollar will continue to use and they don't what bitcoin is and what is the value of bitcoin, they will use what they feel easy and simple.