I think it will not happen paper money will always be there because this money has been used for a long time. everyone still loves holding paper money for buying and selling. and there are still many people who do not trust cryptocurreny and know about cryptocurrency.
I agree that there are few people do not trust cryptocurrencies and not even know about it.There are few corners of the world where electronic transactions are not growing faster than cash.But the movement away from cash is happening in very different ways and at varying paces around the world.But I dont think paper money will diappear that easily.