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 think the paper money more easily lost or damaged mate in contrast to digital. I think for the future everyone is using smartphones and connected to the Internet, I think the deal and transaction as it could be done anywhere. seems to have answered your statement