This is a good article that lays out what might happen next. Obviously the latest rate change affected a lot of people. Not just webcasters by businesses that were built around creating platforms for those webcasters. They might be better positioned to state their case to SoundExchange. That's what this article suggests:
http://rainnews.com/small-webcasters-enter-the-unknown-of-2016/
http://rainnews.com/small-webcasters-enter-the-unknown-of-2016/