#3?
I love the book and have read it a few times, so I know that in the original story, there's only the two parts. But *minor spoilers* enough of them survive, and the timing would work right for their ages to make a third part, like a trilogy, could potentially even include grandchildren or something.
To be clear, I personally think this would be a horrible idea, but with money-hungry studios, I could see it happening.
Thoughts?