Idk, be cool to have a small cameo of one of the JL guys, just in a scene at the beginning of something, but I don't want a story that would require any of them.
Definitely love to see a Bat family member, either Nightwing or Batgirl.
One thing I love about this DCEU is that it gives Batman a chance to shine in a world very different from The Dark Knight Trilogy, amongs Gods, Monsters, Aliens, Magic. How can a man expect to be effective in a world like that? Well, if that man is Batman, he'll find a way!
BUT, for a Bat solo flick, get back to basics. Take advantage of the things that make Batman great and unique. Bring it to Gotham, get him back on the streets, in the shadows, taking on human criminals.
This is why Batman isn't all time favorite comic character, fictional character in general: He, and his environment, and the villains and characters he interacts with, are this wonderful blend of:
Film Noir
Gothic Storytelling
1930's Gangster Movies, with James Cagney and Humphrey Bogart
The old Dick Tracy serials and comic strips
Sherlock Holmes
James Bond spy stories
Edgar Allen Poe
All the great Action films like Indiana Jones and Die Hard
All the great Cop movies like Dirty Harry, The French Connection
All the great noir Hard Boiled Detective murder mysteries like Chinatown, and The Big Sleep
The old Universal Monster Movies, like Dracula, Dr. Jeckyl and Mr. Hyde, Wolfman, Frankenstein, Phantom Of The Opera, Nosferatu, The Man Who Laughs
And probably a lot more I'm forgetting. Oh, and by the way, he's a F***ing NINJA!
And, you know who understood all of that better than anybody? Paul Dini. That's why Batman: The Animated Series will forever stand as a brilliant love letter to, not only the character of Batman, but to every one of those influences.
DC Comics is this great amalgamation of all our mythologies through time, and includes the Sci Fi Space Opera, and Greek Mythology and Epic Fantasy and Christian Mythology, but Batman and Gotham City is it's own thing, a perfect blend of the darker, gothic noir brand of storytelling. And his films should reflect that. Basically, I want to see a more detailed, adult version of The Animated Series come to life.