Its just the bitcoin going to be like gold was they made some mistakes in history when the central bank gold was sent to forth knox and stoled from there.... now they have bitcoin wich is far more safe
My conclusion: the cash will stay just the way to create the wealth and money will be changed.
indeed money must exist and cannot be eliminated, because here we cannot be selfish just because as bitcoin activists, but we are only a few percent. while in the world there are still people who live using fiat money without experiencing any problems. here we have to be a pioneer that not everyone likes bitcoin, but everyone likes fiat currency. if not, of course we have to create our own country, and eliminate fiat currency and then create a transaction system with bitcoin.
for whatever reason fiat money remains the primary transaction tool for all of us.