Here is one idea that I'm not sure has been discussed.
I would like to see within the re-release of the books, I longer version with more detail. I know that what we have so far was 54 books, but some of them were completely useless and took away from the main story line (Jake's grandpa, Cassie's Sydney trip). It would be better if those were just a few chapters of a bigger storyline.
I would like to see about 10 books or so, each one much longer and more advanced than the old books. Maybe have roughly 4-5 main characters narrate it in different segments. Still cover the full story, but just take out some of the stuff that didn't need to be there, while adding some new material to the storyline.
That just seems to me it would make more sense.
Although I've said before I don't want any change to the books if they re-release, after thinking more about it, I think this would be want I want to see.
Also, if they do decide to continue the story, can't they just say that The One was one of Crayak's inventions and have the Ellimist turn time back to the final battle, changing everything by not allowing the Blade ship to escape?
Maybe Visser 3 doens't die and then the story can continue with them fighting on a broader scale, in sort of an all out war (but still guerilla warfare tactics).