I had just started using iTunes radio about a week ago. For some reason I couldn't get Pandora to stream on any home devices (ATV, iPad, iPhone) for more than about 5 minutes, so I figured it was secretly being made wonky by Apple to encourage me to switch to iTunes. I guess now I need to go back and figure out how to get Pandora to stream consistently.
Music family plan and use it quite often on my SONOS setup. This change won't affect me obviously, but I can see why people would be annoyed by making these stations unavailable for free, especially if people would regularly turn around and purchase songs they heard on these no longer free stations.