Paper money is more durable than electronic money. Obviously, you cannot accept electronic money any place that is not specifically set up to take it, or when power or internet is out. I'm not sure you'll ever eliminate physical currency for that reason.
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.
Paper money will never die it will always exist majority of people will continue to use fiat in future too as they find it easy an convenient and using bitcoin is something really complicated for them.