The problem with that is that it will absolutely lack the original author's unique vision and touch. So while someone else could basically "finish it" as a secondary developer, it simply wouldn't be the same. You might think that sounds a bit childish, but it's true. Just look at the new Star Wars movies compared to the old ones, for instance. Different writers caused the tone to shift and change so drastically they were only barely superficially related to one another.
It just isn't possible to have a seamless transition from one author's input on a work to another's.
-Mal