The way its going, i dont think it matters who directs it because it will all go downhill, the big mystery aka the jockeys are revealed as big humanoids and THAT we did not want.
I kinda get it, that this final movie we got wasnt the way Ridley wanted it to be, its impossible.
I like the movie, but it didnt even once satisfied my curiosity for the jockeys and the other mysteries like the green crystal and the murals.
But if another director goes for it, i would give Fincher a free hand. After seeing Zodiac for the 10th time, i would give it to him, he knows how to keep a long story interesting.