I think there would be no future for paper money . if there's an future then it always use as paper money and physical money to buy some things that we need to. in daily life and paper money will never disappear right as long as we are using bitcoin then there would be a paper money to use too.
We have been using paper money ever since, and we have the best experience so far over the other forms of payment. With paper money we can transact anywhere we want to and that makes it very simple, so people will not surrender paper money for bitcoin.
Yeah even if bitcoin becomes huge in future there will be many people who will go with only paper money as they are used to it and the fact is there is no hassle in using it as it is accepted everywhere.
Well the world need improvements the weather is changing due to polluition, printed money its a waste of resorces and it should advance into digital moment we are living already, where we can do anything at home from computer and cellphone.
Paper money can be plastic money LOL, I think making money is not tree consuming as before. Government had already learned to recycle used material and recreate it the same like before. Beside, there is another approach to that, there is specific trees that can be use as papers so creating paper money does not necessary mean they are cutting all the trees in the world LOL.
Anyway I agree that the money system need to evolve.