You don't need a Bitcoin exchange for doing transactions as a business. Bitcoin-otc at http://www.bitcoin-otc.com/ and Local Bitcoins at https://localbitcoins.com/places/628236/phoenix-az-usa/ do it by providing a rating service for people who transact through their sites. They don't handle the bitcoins. They simply advertise and rate.

If a company wants to remain in business, it has to be honest and fair, even without the use of Bitcoin. Once people wake up to the fact that the honesty includes Bitcoin transactions, exchanges just might become a thing of the past... being replaced by rating agencies.