At the very least, large companies need to anticipate short-term stability, which is I think what the quote was getting at.
A small company, for which a day's takings in Bitcoin is only a fraction of the day's Bitcoin-to-local exchange volume can easily cash out immediately, and so has no need to have an expectation of long-term or short-term stability.
A large company typically cannot convert a large amount of Bitcoins to local currency instantaneously without destabilising the exchange rate, so they need to have an expectation of short-term (e.g. month-long) stability in order to manage the transaction volume against the local exchange markets.
Making (largish) loans in a currency implies expectation of decade-long stability.