i dunno if it will be worth making it a "single game". there's too much legacy code in those earlier books, i highly doubt they will be able to untangle the mess to make it actually work out.
dont get me wrong, im not saying i dont want them to make more books, i just think, here, it would've been better for everyone if they just made each book, its own game.
this isnt a deep rpg, a mass effect or dragon age that makes uses of early decisions. there arent that many things you can choose diferently, besides a very select few.
the idea of making everything into one is nice, but it doesnt actually adds anything to this particular project due to how diferent things are.
also, i want to make this clear, im not bashing them, im just saying, that had they made each book its own thing, the game would be better for everyone(and im not asking them to cut it down now, the "deed has been done" so they need to just keep doing it).