I agree with you, especially in my country there are many place that hard to get internet. So paper money very usefull on that place. I think paper money will permanent in some place.
Yes just think of poor countries where there is no access to internet and mainly people are paid on daily wages in fiat, so they will only use fiat as they don't have any other option for their spendings.
Agreed, the future of paper money is safe as I don't think that bitcoin can have an impact on it as people will use only those currency that they are comfortable and they will continue to use which is easy for them.