The whole argument that you can't make exciting prequels unless you reboot is nonsense. The Star Wars prequels prove that.
I'd argue that the Star Wars prequels are evidence for a case against that very point. Or rather, while The Phantom Menace and Attack of the Clones both effectively set things up nicely with brand new and interesting situations (allegedly), I'd say that a lot of Revenge of the Sith is rendered pointless by the foreknowledge of what is to come. There is no dramatic weight to a movie when the outcomes are a fore gone conclusion. It just becomes a process of connecting the dots. The first two prequels can kind of dodge that question because they take place much earlier in the timeline...
I've got a theory about where and how George Lucas tied himself in knots when he was plotting those movies out, but it's probably a discussion for a different thread.