The big banks want to do away with physical cash.
Because it represents a means of getting your money out of the system.
In its efforts to prop up the Too Big To Fail banks, the Fed has made keeping your money in a bank a low value proposition.
To whit, for decades individuals kept their money in bank savings accounts for two reasons:
By not implementing any real reforms to the banking industry, nor jailing anyone who committed the fraud that caused the 2008 Crisis, the Fed has irreparably damaged #1.