Krantz wised up, deciding that it made more sense to have Spider-Man battle "100-foot robots and Nazis." The studio passed. Hard.
Why It Would Have Ruled
If only Kickstarter had been around in 1976; we could have crowd-funded a Spider-Man movie musical with robots and Nazis and then everyone could die, because that's the only thing that anyone was put on this Earth to do. Making that ridiculous movie happen is the only thing stopping all of humanity from quantum-leaping to our next mission.
I'm not saying this would have been the best Spider-Man movie ever, but boy it would have been rad. Today, the entire Spider-Man franchise can be rebooted and reimagined less than a decade between franchises. Already we'll have a different Batman within the next five years. Understanding that, we have to accept that we can't be precious about these properties anymore. We don't need to sit around and stress over whether or not someone is going to do justice to the source material, because if we don't like what Marc Webb does with the next Amazing Spider-Man, it's safe to assume that someone else will get a shot before 2020.
So, since authenticity is no longer the endgame, originality needs to be the goal. And while I genuinely don't know if Spider-Man fighting Nazis does make more sense than a Spider-Man musical, I do know that Krantz's version, regardless of what happened, would be the most original Spider-Man movie we would ever see.
Hey, speaking of people who should be tried for war crimes ...