Over saturation is a great point, especially since Led Zeppelin was introduced into the conversation. I know I've reached the point where I would drive off a bridge if I was subjected to any extended run of Zeppelin, AC/DC, Aerosmith, or a few other bands' songs. Why is this? Over saturation of course. In Chicago, we have exactly one alleged classic rock station. And you can pretty much set your watch to the completely vanilla song pattern of AC/DC, Zeppelin, Aerosmith, Stones, some other popular one off song, repeat. Plus, if you can believe it, things were even worse when we had two alleged classic rock stations. How? On several occasions I'd flip back and forth between them, and they would literally be playing the EXACT SAME SONG.
So yes, after you've heard "Thunderstruck" for the 347,628th time, it gets a little bit maddening. Could the same occur if Disney were to start peppering the big screen with a dozen superhero movies per year? Certainly seems plausible.