I agree that they need to fully reboot it if they're going to do it. This includes the theme as well. John Williams is awesome, and that theme is iconic, but indeed they just need to completely break free from the past Superman to reboot this properly. Indeed Batman is a good example for how it's not going to ruin it.

To note, though, just because Zimmer says he isn't doing it, doesn't mean anything. In fact, there's still plenty time for Nolan (or Snyder) to come to him to do it. If not Zimmer, then there are plenty others. I would almost bet that, in the end, Nolan or Snyder will approach someone to completely re-theme Superman much like was done with Batman.

Feel torn too, huge fan of Zimmers work, but love the Williams score. As soon as you hear that music you think Superman. I just don't know, but if I had to pick between a new theme and Williams, I would go with Williams, although I like the thought of a complete reinvention of Supes, out of all the big screen superman movies Williams theme is about the only thing that worked in everyone of them, so my argument would be why fix what isn't broken.
But do also agree with you guys too. Hard one

Agreed, but there's no telling if Williams would come back for it. He could make great new songs, but he might not be available. For some reason I want to say he's retired now....