I would bet against a movie, even if it was really Dark Knightish & successful, moving
Detective off Robin. When Robin was intro, sales roughly doubled; recall, most of the comics audience was (& mainly remains) teenage boys. I don't see National sacrificing 'em. If Orson made a very adult-targeted Bats, it'd be closer to the original Finger/Kane character, & might bring in more (adult) readers. You might get a separate, "mature readers" spinoff Bats solo book, tho, until
SoI kills it. When Silver Age Bats appears, you might see Robin even being more prevalent (if that's possible), in reaction to
SoI. A
Robin book? Early
NTT? Earlier Nightwing?
Of course, if you bring more adult readers to Bats sooner, a kind of "
Watchmen effect", you might get "mature readers" books in other areas, too. IMO, there's 2 possible outcomes there: comics are banned as too violent (loonies like Wertham unable to distinguish adult & kid books), & possibly much earlier underground books doing the EC-type horror & "mature reader" superhero stuff. Or, maybe a "goldener" Golden Age, with more literate books, in the EC/Phoenix Saga/
Watchmen vein, much sooner & much longer, including (maybe requiring) independents. Maybe even no "death" or Silver Age... Which could conceivably butterfly the Marvel Revolution...
It'd probably butterfly all the monster comics, too. And it might butterfly all the awful '50s monster movies. Might be lo-budget superhero junk: "Captain Canuck
versus The Radioactive Ant Farmer". (
Scotty?)