You are right it would not bring the monetary base to zero. What is in the monetary base:
The Adjusted Monetary Base is the sum of currency (including coin) in circulation outside Federal Reserve Banks and the U.S. Treasury, plus deposits held by depository institutions at Federal Reserve Banks. These data are adjusted for the effects of changes in statutory reserve requirements on the quantity of base money held by depositories.
Freedom is a state of mind. Nobody can take that from you unless you let them.