Paper money will be banned entirely?
How long do you think that happens?
would it work?
What security and privacy risks would it raise?
And how would public and privately issued monies interact?
This ideas are still on experimental level. Right now the banks or governments or any in the financial institutions has not yet foresee the negative impacts that this initiative will bring. People have adaptive capacity they will adjust and find answers and alternatives if problems occurred during the implementation. Hence, ther is no need to worry, no guts no glory as they say.