When hurricane Sandy hit, she felled several large oaks on our property, a major "revision" job, if you want to compare it writing. Luckily, the storm left the house still standing. Subsequently we took down two more immense oaks threatening the the house. Oddly, from within the house it is impossible to see where the missing trees once stood. I know a writer who is valiantly revising a very good story. He calls me when, like the hurricane, he chops whole sections. He has chopped out thickets of writing that don't move the plot along. But the main character and the plot are still standing, and the story is moving forward to what should be an excellent conclusion.