That's your own appreciation for the theme talking. People with no exposure to it before may like it, sure, but it doesn't define Superman for them. If they're going to give the current generation their own Superman, which they have to do in order to be successful, they need to create something new from top to bottom. Part of the reason Superman Returns failed (for lack of a better word) was the strict adherence to the Donner version of the character and everything related to him, music included. Today's audiences flat out don't care about that version, and nothing about him holds significance.
We may not be happy about that, but that's just the way things work. To move forward, the current generation needs their own version of the character to identify with, not the version their parents grew up with.