Bitcoin is a digital currency which fuels the blockchain technology and is the custom countries which can be transferred through it.
Having as a bank note is retrogressive and unnecessary.
It can of course be stored in hardware wallets which is offline.
The world is gradually rapidly moving towards a cashless society, we can't be going in the opposite direction
Exactly. We already have this amazing technology that provides for the structure of a digital currency. Why go back to the traditional and problem-prone paper money? A digital currency provides so much potential, not just bitcoin, but there are cryptos designed to reshape the market with features such as a virtual market place, an escrow system etc. There's so much we could explore if we move forward with the technology.