A bank account (or a spread of bank accounts across different banks to stay under the FDIC insurance limit per-account) is way, way, way safer than a flat market cap publicly traded company -- and with the same or perhaps better rate of return. Stocks are "supposed" to give better rates of return than "flat", in exchange for the higher risk.
For example, if the market cap is $6B and has been for years, how is that reducing?