As of the moment, paper money is more liquid compared to bitcoin. Banks nowadays have a difficult time distinguishing what bitcoin is and do not see it as a currency. On the other hand, having paper money is being accepted all through out the world. Bitcoin is still on the verge being regulated by some countries. For example, there is this news wherein an airport is converting to be cryptocurrency friendly where they would be accepting Bitcoin and other alts as payment for coffee, tickets etc. Apparently, people go into bitcoin thinking that they would make profits due to the volatility of its value. Having paper money would have a more stable price. Having a physical currency is accepted and more realistic for other individuals compared to bitcoin being a speculation for some people.