This was to be expected with a 80% decline in the value of the coin. Why would people want to spend their hoarded bitcoins in a time when those coins are valued less than 80% of their previous value?
Most people also do not buy back the bitcoins that they used, so they take huge potential profit knocks when the price recover again.
These payment processors are also being used less, because people are now seeing the disadvantages to using them, compared to using Bitcoin directly. <P2P>
They only add additional fees to the transactions when conversion to Fiat is done, when you use these services.