With the success of Marvel's The Avengers, many assume DC will attempt a Justice League movie of their own. This remains the likely action, but I don't think this is the route to go. DC superheroes, particularly Superman, Batman, and Wonder Woman, have a far larger significance in the non-comic book world. I'm not sure how a collaboration of these heroes can be successful while giving these big names enough screen time. There's also the obstacle of Bruce Wayne being a mere mortal man. In the Dark Knight Trilogy, lacking the supernatural, Batman seems like a badass. Next to Superman, however, he would not have the same "wow" factor. That's why I believe that Warner Bros. and DC's plan should be to release multiple solo movies with no collaboration. I know it's not the popular route and I would be shocked if we didn't see a JLA movie in the near future, but I believe DC heroes have a stronger solo entity. The strongest of these entities being Superman, and here is how I would set up the Man of Steel Trilogy:
1. Man of Steel
Clearly this is beyond me at this point. Like Batman Begins, I hope it's an origin story with a solid action ending. Man of Steel appears to be utilizing relatively unknown villians, like Batman Begins, who still pose a significant threat. Rumor has General Zod, Black Zero, etc. being among the antagonists, all from space. Rumor also has Wonder Woman in a cameo, which I hope isn't true. Although if the JLA movie is happening, it might be a good idea.
2. Man of Steel Reigns
This will have a similar structure to The Dark Knight. TDK featured Batman's most popular villan, The Joker, as well as another popular enemy, Two Face. MOSR would feature Lex Luthor(the scientist/business man version, no supersuit) trying to destroy Superman for some reason or another. He would invent Bizarro, who Superman defeats, and then creates Metallo. This could be an epic movie which, unlike TDK, ends with Superman on top of the world, victorious.
3. Superman
After a long legal dispute, Warner Bros. gains the right to use the movie title Superman. This has the potential to conquer The Dark Knight as the greatest superhero movie of all time. Brainiac and Derkseid team up with intent to destroy not only Metropolis, but Earth, and potentially the universe. Lex Luthor could team up with them a la Superman II or he could create that supersuit. I prefer option one. The world expects Superman to win this war, and that burden is almost too much for Superman, for he knows it's nearly impossible. He ends up sacrificing his life for mankind but, unlike TDK, he stays dead. Not only would this reflect Jesus, who Superman is extremely loosely based on, but it would shock the world. It would be a ballsy move, but done right, could be the most epic ending to a movie the world has ever seen.
In conclusion, I believe DC should not only make a trilogy for Superman, but Wonder Woman, Flash, Green Lantern, Aquaman, Martian Manhunter, and Cyborg. All incarnations of Flash and Green Lantern could get their own trilogy, as well as a Nightwing trilogy featuring John Blake. There are still plenty of unused Batman villians like Penguin, The Riddler, Mr. Freeze, Hugo Strange, Harley Quinn, and Poison Ivy. All in all, this is what I want, not what I expect. Thanks for reading and have a nice day.