No matter how much I like Bitcoins , it cannot be used instead of paper money.

It's Volatile
It does need internet
We need to solve the transaction fee problem
There is still updates needed in lightning network
Bitcoins is not acceptable everywhere in the world
Many banks are not in favour of Bitcoins and thus they usually ban the accounts if they are being used
Bitcoin will need fiat for sure
We have people living without electricity and mobile phones what about them ?
What about old people and super young kids ? How will they be able to buy anything ??