Well yes, you still need Anakin to fall to the dark side, and maybe what happened in the prequels is a way to do it, but I'm not sure it was the best way. They certainly didn't need to have her die(and they shouldn't have, to be consistent with ROTJ).
If you are going to remake them, a better telling of all the main plot points isn't going to cut it. Ideally you could get a really good writer who never saw the prequels, only saw 4,5,6 and now 7 to come up with a back story that fits.
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