I think people suggesting names like Spielberg, Jackson, Cameron, even Fincher, Del Toro, Aronofsky are being unrealistic. They're more likely to get a guy with a solid background in quality films, who has yet to break out with a massive blockbuster smash, like with Nolan, and even Burton was known more for cult hits at the time. My favorite pick out of the choices suggested so far would probably be Tomas Alfredson.