In the near future all the big companies will start accepting bitcoin as their payments. It is good that PayPal has started accepting bitcoin as their payments and they are trading in bitcoin because they know the importance of bitcoin and they have realized that bitcoin is the future currency and all the people in the world will use bitcoin as their legal and regular currency for their day to day needs.
With a fee of 0.000339 BTC per median transaction size of 226 bytes is hard to believe that bitcoin will be ever used by big companies (eg. McDonald's) for small payments.