I think venturing into rewriting a story can help put the spark of life back into it if it just kinda dies out and you lose the inspiration to ever finish it. It brings the excitement back into it that you felt when you first started writing it. I know this first hand because Ana and I are currently in the process of rewriting our Second Chance series that we started way back in 2000. We made it all the way to the third/final story of the series and then we kinda just stopped writing. We didn't have the best skill when it came to grammar, quality, and the sorts, but we have matured quite a bit since first starting and our writing has improved more then we would have thought. Now we've decided to try to pick it back up and we are even more excited about rewriting it then we were when we tried writing it the first time around.