Ugh, Frank Miller has not ONCE proved his skill as a director (I don't care how magnanimous Robert Rodriguez is, he alone directed Sin City) and you're thinking of him to follow (or replace?!) Christopher Nolan, one of the most talented directors working today??
Riiiight.
Frank Miller was a terrific writer/artist who did some revolutionary things to mainstream comics and crafted some fantastic graphic novels, but recently he's become a weak parody of himself (Sin City: Hell and Back, DKSA, All Star Batman, the upcoming Batman vs. Al Quaeda). He might display some directorial skill with The Spirit, I'm genuinely interested, but the trailer and preliminary pictures fill me with dread that it will rather be an overwrought, morose noir/pulp pastiche like Sin City instead of the delightful, inventive universe created by Eisner.
Furthermore, Miller seems incapable of writing Batman any other way than as a psychotic fascist, which was a cool hypothetical avenue in DKR, but has gotten stale since and is far from my favorite (or the definitive) interpretation of the character. So a third film by Miller? I'd rather have none at all!