Whether people like it or not, technology moves forward. Sure, places are still using FM broadcasting to allow you to listen to a tv station at a gym, but this too is old tech that will be replaced at some point. Apple can't keep making things to work with legacy systems. If they did, we'd be listening to music on walkman style tape players - with built in fm radios...
For Apple, a big part behind doing what they do is monetizing as many parts of their products and systems as possible. Radio doesn't do that. Frankly, Apple changed the way we consume both music and data and it will be up to 3rd party companies to work within Apple's technology if they want to succeed.