You have a point..Yeah, even this days there are still those cultural minorities who even don't have the idea what is a computer.. Most of them are still using those metal coins...When they have a paper money, it is already has a big value to them.. even if it is only in 2 digits..what about bitcoin? I don't know how they will understand those .000 or even if we convert it to satoshis of 1000, that is still hard.. so I think paper money would still be living a long life..
I'm confident we won't see a move towards a completely cashless society in the next few years, but stuff can always change.