Has any bank to date ever refused to give cash to someone because they didn't have it?
ATM are disappearing? Erm, no. They are not.
https://www.psr.org.uk/psr-focus/access-to-cash/uks-atm-network
Whilst cash use is falling, understandable given the amount of options technology has provided to make us part with our cash, it still represents a large amount of transactions. Cash may never ALWAYS be with us, but there is no point i can see in any of our lifetimes that it will simply be gone altogether. What we have at present are lots of options for the economy to transact with wealth. Nothing more...