It won’t happen right away. Laws banning cash will be sold to the public as fighting terrorism and drug-smuggling. Banks will of course be on-board, as part of our crony-capitalist Federal Reserve system, they play along for their seat at the table. they will sell it as convenience and safety.
Then after that comes the IRS, EPA, FDA, etc... with rules indicating when, where and what individuals and businesses may make transactions.
The Euro was sold that way, too.
And the suckers who bought civil asset forfeiture and no-knock raids by militarized police on the same basis will probably fall for it again.