It doesn't cross my mind that humans to stop using cash, because cash is the country's currency, and not all people know a system like this, especially for those who cannot read and write. I just think the blockhain system can be used by the community in a positive way, because this technology in my opinion is very good for the masses who will come and can relieve humans in terms of payments and transactions.
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Absolutely correct, yes the majority of using real money is more than system users like this. It's not so easy to stop currency because it's a reputation of a country also the economy of a country is considered only in currency value.   Yes there are chances to change in upcoming generation.