If that is Kasdan's idea its a brilliant one - if it's not Kasdan's it's still a brilliant idea. Not only does it return mystery to the character, it shuts down the prequels and allows us to forget them in the original trilogy.
I'd love them to do this... What are the chances? It's a great concept for a movie, but doesn't fit in with "canon", so I doubt it would happen - but man it should!